Identify the prefixes and or suffixes in the word. unbelievable

The prefix is "un" and the suffix is "able".

Your answer is prefix ... and this is why ...

A prefix is an addition of something usually a word or letter at the beginning as a prefix or introduction ...

A suffix is a morpheme added at the end of a word to form a derivative, e. g., - ation, - fy, - ing, - itis

If you take away the un you have believable, to change the meaning of the word they added un to the beginning of the word, that is a prefix.