Posted by **makeeda** on Saturday, January 9, 2010 at 4:05pm.

which of following is not a prime number?

A)17

B)23

C)31

D)51

- math -
**Luv4ever**, Saturday, January 9, 2010 at 5:08pm
What do you think? First of all go on to Google and look up prime numbers. You'll get a way better understanding of them in a small amount of time. I'll give you one hint: 51 is a prime number because 3 and 17 are it's factors.

- math -
**PsyDAG**, Sunday, January 10, 2010 at 5:31pm
Luv4ever has a typo.

51 is **NOT** a prime number because 3 and 17 are it's factors.

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