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.
(20)
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)
Yogesh said:
4 years ago
No, it's divided by 7 it is not a prime number.
(4)
Rishi said:
4 years ago
97 is the answer because we can't divide this number with any prime number.
(3)
Naina Bhardwaj said:
3 years ago
Good explanation,Thanks @Viki.
(2)
Siddharth daggubati said:
8 years ago
Yes, 97 is the prime number.
(2)
ARUN said:
2 months 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
(1)
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)
Paimon Dkhar said:
7 years ago
97 is a prime Number.
(1)
Abdulmajid Ma'aji katsina said:
4 years ago
Thanks all for explaining it.
(1)
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