should you selected to Enjoy the Megaplier, any non-jackpot prize you get is multiplied through the Megaplier amount that's drawn.
A Megaplier selection from 2 to 5 is drawn around the evening of every Mega Millions https://jasperjblb711512.wikiannouncing.com/5487399/not_known_factual_statements_about_mega_millions_numbers