Try to read into his actions more. Does he do anything that singles you out as special compared to the other girls? If not, he may just be being friendly.
If you are interested in him, try to see if he shares that. Edge around it, by giving him compliments and starting to flirt with him. If he doesn't respond, then you will have your answer.
*You can just come out and ask him for a date. However, then you may have to face rejection. Normally, this is how I act. Usually it has yielded me with good results, but that is reflective of my personality.