# Which of the following is not a prime number?

**Ans. 91** is not a prime number.

**Reason:-** 91 is divisible by 7 and 13.

Prime number is that numbers are not divisible by any other number.

**Ans. 91** is not a prime number.

**Reason:-** 91 is divisible by 7 and 13.

Prime number is that numbers are not divisible by any other number.