Question

Which one of the following is not a prime number?
A. 31 B. 61
C. 71 D. 91

Answer 1

@ganeshie8

Answer 2

@agent0smith Sir plz help me


and give its concept too

Answer 3

91 is divisible by 7.

7x13 = 91

Answer 4

@promisespromises

Answer 5

D

Answer 6

Prime means it is only divisible by 1 and the number itself. So the only number up there that is divisible by something other than 1 and itself is 91. As @agent0smith stated.