"Do i have root?"
This app will answer your question.
It will also give you a few details about your su binary,super user application and busybox.
Press the button and read the results.
Maybe share them afterwards.
You can find the source code for this app on GitHub:
https://github.com/d4rken/rootvalidator
This app will NOT root your DEVICE!
If this came preinstalled with your custom ROM, don't ask me how to uninstall it!