* If you mean the ultimate origin of the word "root," then yes, it comes from the Latin word "radix," meaning "root."
* If you're asking about a specific word's root, it may or may not be Latin. Many English words have roots in Latin, Greek, Old English, French, and other languages.
To figure out a word's root, you need to look at its etymology (history of the word's origin). Online etymology dictionaries like etymonline.com can be helpful for this.
For example, let's take the word "education." Its root is the Latin word "educatio," which means "a bringing up, training, rearing."