A prefix such as in the word unhappy, can be called a?

My answer was a morpheme but can't it also be called a phoneme?

4 answers

un-

Yes, it's a morpheme because it carries one unit of meaning.

However, it's made by combining two phonemes: /u/ and /n/

https://en.wikipedia.org/wiki/Phoneme
a trick question because? of can be called
I don't understand that. Please re-type and proofread before you hit Post.
is this a trick question, because the question contained the word (can)
and un is a morpheme, not can be called