Question

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

Answer 1

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

Answer 2

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