Why do guys ask random girls for their number?

Anonymous
so i was going to college and as i got off the train heading toward the street , this guy compliments me and i say thank you. as i am leaving i hear him catching up to me starting a conversation. he told me he was moving here soon and he is starting college. he asked me what college i am going to , and then proceeded to ask for my number? i was so nervous about this because i didn't know this guy at all and he was a complete stranger. should i be concerned? and why did he ask me for my number if he didn't know me at all?

Why do guys ask random girls for their number?
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