It never even occurred to me to ask the room steward (being a newbie on my first cruise). We had 4 people in our room and I was worried about the same thing. I just used a bunch of the wire hangers like you get from the dry cleaners. I doubled up shirts on some of the hangers and then just brought more. They don't take up any room. I just slid them in one of the outside zipper compartments on my suitcase.
That is not a dumb question at all We always bring hangers from home because the hangers they provide are the big wooden hangers. They're nice, but they take up a lot of room, and we hang almost everything (except shorts and underwear ). We either ask the room steward to take them or we store them somewhere out of the way.
Have a wonderful cruise,
"A truly happy person is one who can enjoy the scenery on a detour."