Is he scared of me?

It'd be the most reliable way of making sure he gets a chance to. Or you could ask him yourself; I know many women are hesitant about being the one to initiate things, but remember that you're not asking him to marry you; just to go to a dance. And once he relaxes around you a little, he'll be less nervous and more willing to ask you out to stuff (assuming it goes in that direction).
If you already know he likes you because it's been hinted at or you've been told and it sounded legit along with trusted then just go for it.
By a higher chance you will not get rejected and it will save time either way.
Opinion
2Opinion
It's possible he likes you, but isn't keen about going to the prom. Talk to him yourself. Would you still like him if he preferred doing something else with you?
I say ask him directly, or its never gonna happen.
Superb Opinion