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A prime number is a natural number greater than 1 having no positive divisors except 1 and itself. A composite number is a natural number greater than 1 that is not a prime number. For example, 7 is prime because only 1 and 7 evenly divide it, whereas 10 is composite because it has the divisors 2 and 5 in addition to 1 and 10 itself. Have fun!

- jips
- Site Admin
**Posts:**3**Joined:**Thu Oct 10, 2013 7:55 pm

I have always have a doubt:

Is number 1 a prime number?

Is number 1 a prime number?

- bankhacker
**Posts:**1**Joined:**Mon Dec 02, 2013 2:07 pm

Well, actually I have a similar question too: Is zero really a prime number? Has that any sense?

- macroenanito
**Posts:**1**Joined:**Mon Dec 02, 2013 5:22 pm

According to the definition, it is compulsory that a number to be prime must first be superior to 1. So, numbers 1 and 0 cannot be prime numbers, as well as negative numbers. Nevertheless questioning about this extrem cases have any sense is really interesting. Just throwing another point of view: Can prime number concept be extrapolated to real numbers somehow?

- TripleJ
**Posts:**4**Joined:**Mon Dec 02, 2013 5:43 pm

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