Find the prime numbers from the given options.
This question can have more than one correct answer.
13
11
The prime numbers in the given list are 13 and 11 as they have only two factors each.
11 = 1 and 11
13 = 1 and 13
But, 9 is not a prime number since it has three factors 1, 3 and 9
Also, 1 is not a prime numer since it has only one factor 1.