While it might seem like "pre" is the prefix, it's actually a part of the root word itself. The root word "present" means "to be in a particular place or condition".
The prefix "pre-" means "before" or "in front of", which would make "present" mean "to be in front of" or "to be before".
Therefore, the word "present" doesn't have a separate prefix, but rather the root word "present" itself incorporates the meaning of "before".