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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Fri, 5 Sep 2014 15:04:03 -0600
Subject: Re: My backwards logic
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On Fri, Sep 5, 2014 at 11:44 AM, Seymore4Head
<Seymore4Head@hotmail.invalid> wrote:
> BTW since I am getting no grade, I much prefer the answer than a hint.
> The best hint IMO is to tell me how you would do it.

from math import ceil, sqrt

def is_prime(n):
    if n < 2:
        return False
    if n % 2 == 0:
        return n == 2
    return all(n % x != 0 for x in range(3, int(sqrt(n)) + 1, 2))

while True:
    n = int(input("Enter a number: "))
    if is_prime(n):
        print("{} is prime.".format(n))
    else:
        print("{} is not prime.".format(n))