isprime - up to sqrt()

prime2.py

import math.sqrt as sqrt
def prime2(n):
    if n <= 1:
        return False

    # The sqrt is turned into an int() because of the
    # deprecation warning I got for passing a float as argument
    # to xrange()
    
    for i in xrange(2, int(sqrt(n))):
        if n % i == 0:
            return False

    return True