Posted by **Praneeith** on Tuesday, February 16, 2010 at 6:10pm.

can prime number other than 2 and5 3 apart?

explain

- math -
**Reiny**, Tuesday, February 16, 2010 at 6:12pm
no!

the only prime which is even is the number 2, all other primes are odd

If we add 3 to an odd number we get an even number.

e.g. 7 + 3 = 10

- math -
**Damon**, Tuesday, February 16, 2010 at 6:19pm
n and n+3

If n is even (not prime), n+3 is odd

If N is odd, n+3 is even (not prime)

2 is the only even prime number, all bigger ones are divisible by 2.

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