Which of the following is a prime #?

Question

a.2
b.19
c.37
d.51
e.67

I choose 2. But the book answer is 51. The book says:( 2,19,37, and 67 are prime #'s) 3x17=51, so it is not prime.

I forgot what prime #'s mean that's why I choose anything like 2.

help me.

A prime number is a number that can only be divided by 1 and itself. The first 30 prime numbers are:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113

http://en.wikipedia.org/wiki/Prime_number

Probably your question is which one is NOT a prime number.

Yes your right. I made a mistake. the word problem says not a prime #.