text: """Prime game engine."""
  
  import random
  
  import pyprimer
  
  GAME_DESCRIPTION = "Answer 'yes' if number prime otherwise answer 'no'."
  
  MIN_NUM = 1
  MAX_NUM = 20
  
  
  def game_engine():
      """Prime game Q&A generation.
  
      generate random Number and check if a Number is Prime
  
      Returns:
          task{str} : Number;
          answer{str} : Prime status
      """
      num = random.randint(MIN_NUM, MAX_NUM)
      answer = "yes" if pyprimer.is_prime(num) else "no"
      task = "{}".format(num)
      return (task, answer)
  