Question

Which of the following is a composite number? A. 91 B. 29 C. 13 D. 139

Answer 1

13 is a prime number as it is divisible by only 1 and itself.
29 is a prime number as it is divisible by only 1 and itself.
139 is a prime number as it is divisible by only 1 and itself

91 is a composite number because it divisible by 1, 7, 13, and 91.

Your answer is A. 91

Answer 2

The number 91 is divisible by 1, 7, 13 and 91. Therefore 91 is composite since it has more than two factors.