Q&A for How to Remove a Default or Core System Apps from an Android Phone

You should try "frama root" or king root for rooting, and you can also root your phone manually by using your computer. Just simply connect it to your computer and install rooting apps, then in about 5-6 minutes, your phone becomes rooted. Do this at your own risk.

There's very little software that can root Marshmallow as of 2016, but you can try kingroot or kingoroot.

Uninstall or disable it in your Android's settings app. If it can't be uninstalled or is a system app, then root your device (at your risk), and then using the steps in this tutorial, uninstall the app.

It will, but can cause instability. Some system apps are vital to the Android framework.