No! Sit her down, grab her hands, look deep into her eyes, and ask "will you be my girlfriend?" Because that's cuter than asking "wanna go out" so you follow my advice, your life will be nothing but sugar and spice! Good luck! Gimme a follow?
Just ask her out on a DATE, and I mean a date ONLY. "Would you like to go out to dinner with me sometime?" Don't ask her to be your girlfriend, get to know her first, that way you don't find out the hard way that you're not compatible with her.