Check if multiple numbers are prime numbers

num = None
def primecheck(n):
    count = 0
    for i in range(1,n+1):
        if n%i == 0:
            count+=1
    if count == 2:
        return 1
    else:
        return 0

while(num!=0):
    num = int(input("Enter an integer (press 0 to exit):"))
    if primecheck(num) == 1:
        print(num,"is a prime number.")
    else:
        print(num,"is not a prime number.")