Check with this app if your Android phone is rooted.
Root Checker is an application that will let you know if you have root access or superuser privileges on your Android phone or tablet. It is very useful to know if the rooting process that you have done in your terminal has been satisfactory or in any case verify the root status on a device whose past you do not know.
Root Checker Basic is very easy to use. Once put into operation, it detects the model of the terminal, the version of Android that it runs and checks with a simple touch of the screen if it has root access installed. The application is available on Google Play and is for free use.