text: def is_prime(number):
      number = abs(number)
      if number == 0:
          return False
      half = number / 2
      step = 2
      while step <= half:
          if number % step == 0:
              return False
          step += 1
      return True
  
  
  def main():
      number = int(input("Number: "))
      if is_prime(number):
          print("Es primo")
      else:
          print("No es primo")
  
  
  if __name__ == "__main__":
      main()
  