A cleanout is always, or SHOULD always be a 45, but a drain can also lead into a 45 so you can't say it would only be a drain or cleanout. The only way to know is to break it up and take a look.
Is it your house or are you renovating for someone?
Always best to know what's there and you can't know if you don't break up the concrete and see what's there.
No one here could possibly know if it has a trap because the slab is still there.