Default [Q] can I root my Note 2?

I have a Samsung Galaxy Note 2 (Android 4.3) and I have Knox on it, but it isn't installed. I mean that I can see the Knox app on my device but whan I press it it gives me the option to install it.
I'm new in the Android world, but as I understood, I shouldn't install Knox because it blocks the root and ROM options.
Is it true? Can I root & ROM my device?
Thanks a lot (: