Is my ameraucana a rooster?

[PearlaMae123]

We recently bought 2 ameraucana chicks and they're about 4 weeks old. One seems very passive and more hen-like. The other is more aggressive and "wilder". It's illegal for us to have a rooster where we live, so we would like to know what signs we can look out for. What are tell-tall rooster signs in ameraucanas? These aren't our first chickens, but our first ameraucanas.
Thank you!

 

[SunHwaKwon]

Three rows of "peas" and redness in the comb.

 

[Crazy for Chickens!]

At six to eight weeks, cockerels will have bigger, redder combs. Also, depending on where you purchased these, there are most likely Easter Eggers.