I'm guessing owe are cockerels by the development of their combs and wattles. They are a little young, but if they redden or get pink, cockerels for sure.
Too young to say at this point. Usually you have to wait until their 8 weeks or so, unless you have an early cockerel who just grows big red comb and wattles. Which you don't have. Gonna have to wait a few more weeks.