If you try to claim him on paper, and the only reason you give for why you should be allowed to claim him and his father should not is that he spends more than 1/2 his time with you and less than 1/2 his time with his father, and you do not mention child support, then you can claim him as his father cannot.
If you mention the child support situation, in any way, as the reason why you should be allowed to claim him and his father should not, then his father can claim him, and you cannot.
If you only try to claim on an electronically filed return, then you have about a 50-50 shot of being successful. If you fail, then you can still claim him by failing your claim on paper, and not electronically. If you refuse to file on paper, and insist only file electronically, then his father can claim him, and you cannot.
No, he can't.
Don't take this the wrong way.... but you are a college student on public assistance and you have three kids by three guys. Maybe take a health class and work on using birth control. Just so the rest of us don't have to pay for you.
"I have not received anything from child support " - That's because it goes straight to paying for the pubic assistance you receive. You are getting all the money, and then some.