It all depends if he has a girlfriend. If he does it isn't something you should play around with. If you find out he doesn't or if you ask him and he says no ask if he'd wanna hang out sometime after work, then see where it takes you from there.
I'm interested in my coworker. We banter and we're playful. He teases me, I hit him. Our coworkers tease us too. They comment how we'd make a good couple and they could already see our children. I'm so confused. Is he interested?
Well, it sure sounds like it to me !
Usually a relationship at the work place doesn't work out very often though. Talk to him some and learn about him and maybe he'll ask you out. Sure can't hurt!
It certainly sounds as though he likes you a lot. Having playful banter is a great start to any relationship, romantic or otherwise.
The problem with getting along so well with work colleagues is that neither of you are choosing to spend time together. If you hang out all the time outside of work, that's different, but if it's just at work then whilst you undoubtedly have a connection, who's to say the banter isn't just a fun way to make it through the day (and your other colleagues are maybe getting carried away?).
The truth is, you won't know unless you ask, which is always super awkward in a work environment if it doesn't go the way you want!
My advice is to try and create some opportunities where you get to spend time together outside of work- either alone or in a group- and see how he acts in those situations. A different setting away from the office could be exactly what is needed to prompt him into making a move if he is keen... So you have nothing to lose.
And don't listen to what anyone says, sometimes office romances are the best!