input: 
  def primeCheck(num: int) -> bool:
      """
      Check if a given number is a prime number.
      >>> primeCheck(7)
      True
      >>> primeCheck(10)
      False
      >>> primeCheck(1)
      False
      >>> primeCheck(2)
      True
      """
      if num > 1:
          for i in range(2, num):
              if (num % i) == 0:
                  return False
          return True
      return False
  
output:     if num == 2:
          return True
      if num == 1:
          return False