Which of the following is a prime number?
A) 13
B) 21
C) 49
D) 15

Question

Quizplus · Accepted Answer

A prime number is a positive integer greater than 1 that has no positive integer divisors other than 1 and itself. 13 is a positive integer greater than 1 and has no positive integer divisors other than 1 and itself, making it a prime number. 
B) 21 is not a prime number as it has the positive integer divisors 1, 3, 7, and 21. 
C) 49 is not a prime number as it has the positive integer divisors 1, 7, and 49. 
D) 15 is not a prime number as it has the positive integer divisors 1, 3, 5, and 15.

Which of the Following Is a Prime Number