Самое Большое Простое Число – Да/нет

http://www.last.fm/music/%D0%A1%D0%B0%D0%BC%D0%BE%D0%B5+%D0%91%D0%BE%D0%BB%D1%8C%D1%88%D0%BE%D0%B5+%D0%9F%D1%80%D0%BE%D1%81%D1%82%D0%BE%D0%B5+%D0%A7%D0%B8%D1%81%D0%BB%D0%BE