Question: Which one of the following is not a prime number?
[A]. 31
71
[A]. 31
[B].
61[C].
[D].
91Answer: Option D
Explanation:
91 is divisible by 7. So, it is not a prime number.
[B].
61[C].
[D].
91Answer: Option D
Explanation:
91 is divisible by 7. So, it is not a prime number.