Is it Prime with Py

prime.py

enterNum = 1
counter = 0
nubmerOfPrime = 0

def isPrime(num):
  global counter
  if num > 1:
    for i in range(2, num):
      if num % i == 0:
        return 1
    counter += 1
  return counter

while (enterNum != 0):
  enterNum = int(input("enter num: "))
  nubmerOfPrime = isPrime(enterNum)

print("number of primes: ",nubmerOfPrime)