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