Question

Which number is a prime number?
A. 111
B. 121
C. 131
D. 141

Answer 1

A prime number is a number that have no divisors.

A. 111 have 3^37
B. 121 have 11^11
C. 131 have none
D. 141 have 3^47

So you can say that your answer is C. 131

Answer 2

I know for a fact that 121=11 times 11

hmm
to tell if a number is divisible by 3, add the digits and see if the sum is divisible by 3
well 111 is divisible by 3
141 is also divisible by 3



answer is C