Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 9)
9.
Which of the following is a prime number ?
Answer: Option
Explanation:
Clearly, 97 is a prime number.
Discussion:
47 comments Page 1 of 5.
Vidya kharvi said:
4 years ago
Yes, 97 is a prime number.
Because as per prime num definition i.e prime number is a number that is divisible by 1 and itself. 33 is not a prime num because it is divisible by 3, 81 is also not a prime num because it is divisible by 9, 93 is also not a prime num because it is divisible by 3 but whereas 97 is not divisible by any other num expect 1 and itself so, 97 is a prime number.
Because as per prime num definition i.e prime number is a number that is divisible by 1 and itself. 33 is not a prime num because it is divisible by 3, 81 is also not a prime num because it is divisible by 9, 93 is also not a prime num because it is divisible by 3 but whereas 97 is not divisible by any other num expect 1 and itself so, 97 is a prime number.
(19)
ARUN said:
2 weeks ago
An easy way to find a number is prime or not.
Divide the number by 6 and check whether the reminder is +1 or -1. Then the number is a prime number.
formula : 6(x)(+-)plus or minus 1 .
Example:
97 is prime or not.
97/6=6(16)+1=>96+1=97 it is prime number. //ends with +1 or -1
41 is prime or not.
41/6=6(8)-1=> 42-1=41 it is prime number //ends with +1 or -1
Divide the number by 6 and check whether the reminder is +1 or -1. Then the number is a prime number.
formula : 6(x)(+-)plus or minus 1 .
Example:
97 is prime or not.
97/6=6(16)+1=>96+1=97 it is prime number. //ends with +1 or -1
41 is prime or not.
41/6=6(8)-1=> 42-1=41 it is prime number //ends with +1 or -1
Sundar said:
1 decade ago
A prime number (or a prime) is a natural number that has exactly two distinct natural number divisors: 1 and itself. The smallest twenty-five prime numbers (all the prime numbers under 100) are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.
Note: 1 is not a prime number.
Hope this will help you. Have a nice day!
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.
Note: 1 is not a prime number.
Hope this will help you. Have a nice day!
(1)
Yoga said:
8 years ago
A prime number (or a prime) is a natural number that has exactly two distinct natural number divisors: 1 and itself. The smallest twenty-five prime numbers (all the prime numbers under 100) are:.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.
Note: 1 is not a prime number.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.
Note: 1 is not a prime number.
(7)
Prasad said:
9 years ago
If a number have exactly two factors that number called prime number.
ex:7 has 1 and 7 only factors so its prime number and suppose 6 has 1,2,3,6 has factors so it's not the prime number.because it should be exactly 2 factors but here 4 factors are theirs. So it's not the prime number.
Hope you, understand
ex:7 has 1 and 7 only factors so its prime number and suppose 6 has 1,2,3,6 has factors so it's not the prime number.because it should be exactly 2 factors but here 4 factors are theirs. So it's not the prime number.
Hope you, understand
Niranjan Nande said:
1 decade ago
Please take any perfect square near of 97 i.e 10*10=100. Now find all prime numbers which are less than 10 that are 3,5,7.Now at last check wheather 97 is divisible by 2,3,7.If it is divisible then number is not prime else it is prime.
Poorvi said:
1 decade ago
97. Nearest square = 10*10 > 97.
Check if 97 is divisible by prime numbers less than 10. i.e.., 2, 3, 5, 7.
If it is not divisible the given number is a prime number.
Similarly for other numbers.
Check if 97 is divisible by prime numbers less than 10. i.e.., 2, 3, 5, 7.
If it is not divisible the given number is a prime number.
Similarly for other numbers.
Dhiru said:
9 years ago
Find the square root of the number i.e. square root of the 97 is 9 point something Now divide the 97 by each prime less than 9 if it not divisible it will be prime.
Raje said:
10 years ago
6*6 > 33?
(I know 33 is not a prime but) the formla is not appicable at all the time. So is it a wrong formula?
(I know 33 is not a prime but) the formla is not appicable at all the time. So is it a wrong formula?
Pravallika said:
9 years ago
To find prime no we have to divide the number with 2, 3 & 7.
Then only is it called as a prime number.
Then only is it called as a prime number.
(1)
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