This expects a positive answer. These questions can be written as a question with an answer or as a statement. Alternate transaltion: "Did you go out to see a prophet? Of course you did!" or "But you actually went out to see a prophet!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
This phrase means that John was indeed a prophet, but that he was even greater than a typical prophet. Alternate translation: "not just an ordinary prophet" or "much more important than a normal prophet"