Hi guys, im sure a lot of people have asked similar questions and that its annoying to answer the same type of question over and over again

But, im stuck and I need some help.
Basically, there's a girl in my college, she's not in my class or anything and I don't even know her name, I've just seen her a few times. I'm interested and would like to make a move. However, I have no idea what to do, what would I say to her? I don't really want to be standing in the middle of the corridor talking to her for 2-5 mins making small talk, I would prefer to quickly show that I'm interested and get her number or something if possible. I could ofcourse ask her ''can I have your number?'' but im almost sure that girls don't give out their numbers after being asked that question as an opener.
So...yeah...I'm just bad with words and need a simple, short, not creepy opener sorta thing..

Thanks