Question

Which is a prime number?

141
111
121
131

Answer 1

Alrighty, so let me first help you define prime number. Basically prime numbers our number that can be only divisible by the number itself. For examples: 7 is a prime number. 7 does not come in any other table.

131 is the prime number.

Answer 2

131 is the prime number.
111 can be divided by 3.
121 can be divide by 11.
141 can be divided by 3.

Does this help?