Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 1)
1.
Which one of the following is not a prime number?
Answer: Option
Explanation:
91 is divisible by 7. So, it is not a prime number.
Discussion:
108 comments Page 2 of 11.
Monisha Mohanan said:
4 years ago
@All.
Prime number means that a number that is divisible only by itself and 1
Examples : 2,3,5,7,11.
Now in our question the options s 31, 61,71 and 91 here I think in our example we can find that the prime numbers only start with 2,1,3,5,7.
Thus the answer becomes 91.
Prime number means that a number that is divisible only by itself and 1
Examples : 2,3,5,7,11.
Now in our question the options s 31, 61,71 and 91 here I think in our example we can find that the prime numbers only start with 2,1,3,5,7.
Thus the answer becomes 91.
(61)
Jitu said:
4 years ago
Why only 91 is not a prime number?
In this case, 71 is also divisible by 3.
In this case, 71 is also divisible by 3.
(13)
Sharma said:
4 years ago
91 prime or not.
Which square number is exceeds 91?
10 ^2 right. So let's take a prime number which is less than 10.
2, 3, 5, 7.
Check the given number is divisible by 2, 3, 5, 7.
If it is divisible then it is not a prime number.
If not that would be a prime number.
Which square number is exceeds 91?
10 ^2 right. So let's take a prime number which is less than 10.
2, 3, 5, 7.
Check the given number is divisible by 2, 3, 5, 7.
If it is divisible then it is not a prime number.
If not that would be a prime number.
(47)
Sindhuja B said:
4 years ago
The Question is "which is not a prime number".
In a very simple way how do we check whether a number is prime or not, .
The number should be divisible by one & the number it self right!.
Now see their options, that are, .
31. - is a prime number which can only be divided 1 & the number itself.
61. - same here.
71. - here too.
91. - is divisible by 1, 7, 91.
So, among other options, 91 is not a prime number.
In a very simple way how do we check whether a number is prime or not, .
The number should be divisible by one & the number it self right!.
Now see their options, that are, .
31. - is a prime number which can only be divided 1 & the number itself.
61. - same here.
71. - here too.
91. - is divisible by 1, 7, 91.
So, among other options, 91 is not a prime number.
(26)
Tharun said:
4 years ago
91 is correct because the prime number is one which is having two distinct factors so, that 91 having more than two factors.
(6)
Harika said:
5 years ago
31 is the prime number.
Pooja said:
5 years ago
n*n>=p in this form, how take that value by comparing p? Please explain anyone.
Swathi said:
5 years ago
Thanks all.
Jagadees said:
5 years ago
Thanks @Dilipkumar and @Santosh.
(1)
Sagarganeshkar said:
5 years ago
It is very easy by divisibility rules.
(1)
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