math CheckPrime is wrong

[Julien00859]

The current implementation doesn't support:

• Negative values, -1 is not a prime number. Current implementation raise a TypeError due to math.sqrt on negative values.

The current implementation return the wrong value for:

• 0, 0 doesn't have any divider, primes must have two.
• 1, 1 just have one divider, primes must have two.