Question

Which number has only two factors?

6, 8, 9, or 11

Answer 1

11.
The only factors are 1 and 11, which is why it is also called a prime number.

6 for example has the factors 1,2,3, and 6

Answer 2

The number that only has 2 factors which are itself and 1 is called a prime number, in this case it would be 11.