input: 
  def primeCheck(num):
      """
      This function checks if a given number is prime. 
      >>> primeCheck(2)
      True
      >>> primeCheck(4)
      False
      >>> primeCheck(7)
      True
      >>> primeCheck(1)
      False
      >>> primeCheck(37)
      True
      """
      if num > 1:
          for i in range(2, num):
              if (num % i) == 0:
                  return False
          return True
      return False
  
output:     if num > 1:
          for i in range(2, int(num**0.5) + 1):
              if (num % i) == 0:
                  return False
          return True
      return False