How do I get his number or something?

I want to get to know this guy that I see every Tues and Thurs afternoon going to and from class. I don't anything about him except that he's very attractive and always checks me out. If he's checking m out because he finds me attractive I want him to know the feeling is mutual. It has been a while since I've talked to a guy, because i'm super shy, and every time he looks at me I avoid eye contact. I have 4 weeks of school left and I would like to at least get his number before school is over. I seriously don't know how to, especially since we go opposite directions to class. I don't want to miss out on getting to know this guy if he is interested as well. PLEASE ADVICE? *I don't see him any other time except when walking to class, I don't know his name, I don't know him.
How do I get his number or something?
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