I always get confused about how to think of 0. Please tell me if the following are correct -

1. 0 is neither positive nor negative.

2. 0 is even.

3. 0 is a multiple for every integer.

4. 0 is not a prime.

5. Is 0 a factor of every number? I think not but just checking.

Also,

-> Can negative numbers be prime?

-> If an int has only 2 factors then we know it is prime right away, correct?

-> Special sums in Chap 4 (page 43) only applies to consecutive integers. But not consecutive evens or consecutive primes or consecutive odd correct?

-> Average and median of consecutive numbers are equal correct??

Finally!

If faced with a very large number, is there an easy way to tell it is a prime number?? Or a multiple of 7 or 13 or 17??

All this is assuming it is not divisible by 2,3,4,5,6,8,9,10 of course.

Is there a good resource for number properties?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired. If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links:

Quantitative |

Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.