Rootchecker will not Root your android device. Just ensure if the device is Rooted properly or not or have root access also check if busybox installed supersu app is installed or not superuser binary SELinux status .
Ultimate root checker will tell you instantly if your device is rooted and supersu or superuser installed properly.

You should also install BusyBox too to Make Rooted application work properly.

The process of confirming root access is sometimes known by other terms such as gaining superuser access or gaining administrator access. Root Checker covers all these terms as they relate to one core function being able to execute commands through the su binary with root access.

Work on Android Nougat too Marshmallow Lollipop KitKat Jellybean GingerbreadNougat.

If the Superuser management applications (SuperSU Superuser etc.) are installed and working properly these applications will prompt the user to accept or deny the root access request from Root Checker. Accepting the request will allow Root Checker to check for and confirm root access. Denying the request will result in Root Checker reporting no root access