How can I get this boy to leave me alone?

ok so there is this boy that i know because i hav him n my pe, study hall (we rotate those on a n b days so ill c him in either one i hav) and math cl. so for awhile we just kinda knew who the other person was n talked only a little. like in math hed ask if i was done with the ignment (im usualy the first one done) n in pe he used to run by me and yell "stop slacking off" but that was about it. then a couple weeks ago in study hall he yelled "ur hot" at me several times n if i asked wat he said all he said was "u heard me" and he n his moron friends keep talking to me during study hall. on thursday he called me hot again. n yesterday when we had study hall he waved at me whenever he walked by n he n his friends kept asking if i needed a hug or if i wanted him as a bf. then after that cl he n his friend were walkin behind me in the hallway and he said to his friend( he said this very loudly so i could hear him) he said "the girl in front of us is hot, do u think shes hot, i do" then after skool yesterday i was walkin by him when i was leaving to get on the bus he pointed at me (i no he was pointing at me cuz his finger was about 2 inches from me n was following me as i walked by) and said to his friend "that girl is hot" so hes been bothering me lately n im really tired of it. he was gone today but i hav study hall wit him tomorrow. is he flirting or just being stupid for his friends? how do i get him to leave me alone?