How do I know if my device is rooted? Possible Duplicate:
  How can I tell if I have root?  




I am a noob when it comes to android.  

I've read a little about rooting, but I still haven't figured out how to know if my device is already rooted or not (I bought it from a questionable store, so I don't want to just take their word for it).  

I have a Galaxy S2, but I think this question is relevant for any android device.
I think the best way to test would be to install an app that requires root access to perform it's main functions. Like ROM Manager, Wi-Fi Tether or most screenshot apps. They will require root and notify you if you do not have root access.