It's already a complete word meaning someone who lives outside their native country.
However, you might see variations like:
* Expatriated: This is the past participle of the verb "expatriate," meaning to leave one's native country.
* Expatriation: This is the noun form, referring to the act of leaving one's native country.
While these variations are related to the word "expatriate," they aren't considered prefixes or suffixes.