Is impolite a suffix or prefix?

"Impolite" is neither a suffix nor a prefix. It's a whole word that means "not polite".

Here's how it breaks down:

* Im- is a prefix meaning "not" or "opposite of".

* -polite is the root word, meaning "courteous" or "having good manners".

Therefore, "impolite" is a word formed by combining a prefix and a root word.