There is no prefix in the word "archaic".
Here's why:
* Suffix: A suffix is a word part that is added to the end of a word to change its meaning or grammatical function. In this case, "ic" is added to the root word "arch" (meaning ancient or old) to create the adjective "archaic".
* Prefix: A prefix is a word part that is added to the beginning of a word to change its meaning. There is no part added to the beginning of "archaic" to alter its meaning.