def nextNumber():
    n = int(input("Please enter 0 or an even integer above 2: "))
    while n < 0 and n <= 2 or n % 2 != 0: #Test to see if the input is valid
        n = int(input("Please enter 0 or an even integer above 2: ")) #If the input is invalid, program prompts the user for another input, and will continue doing so until a valid input is supplied
    return n
#def testGoldbach(n):
   
def isPrime(n):
    if n < 2:
        return False
    for i in range(2,n):
        if n % i == 0:
            return False
    return True
#def primeAfter(n):
   
number=nextNumber()
print(number) #For debugging purposes
prime=isPrime(number)
print(prime) #Also for debugging purposes