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Simply so, is it safe to Unroot an Android phone?

Any Phone that has only been rooted: If all you've done is root your phone, and stuck with your phone's default version of Android, unrooting should (hopefully) be easy. You can unroot your phone using an option in the SuperSU app, which will remove root and replace Android's stock recovery.

what is a rooted Android TV box? Rooting your Android TV box provides numerous benefits by giving you full access to the system files – allowing you to change anything you want. Rooting an Android device is like jailbreaking an iPhone, you can customize your device to do more advanced things and install apps that aren't available on the Google Play.

Just so, does factory reset remove root?

A factory reset won't unroot your phone. In some cases the SuperSU app might get uninstalled. So on reinstaling the SpeedSU app by normal method you can manage the SuperUser access for your apps. Unroot it using the app or software you have used to root your device.

How do I know if my Android TV Box is rooted?

Install a root checker app from Google Play. Open it and follow the instructions, and it will tell you if your phone is rooted or not. Go old school and use a terminal. Any terminal app from the Play Store will work, and all you need to do is open it and enter the word "su" (without the quotes) and hit return.