It's not dumb at all. I believe someone cited a verse earlier, but I hope you will forgive me for not looking it up right now, as I'm getting ready for bed. (Mass in the morning, you know!)
But the bishops are successors to the Apostles, as can be seen in the passage concerning the election of Matthias in Acts. So all Apostles are bishops; in fact they are the original bishops. As you know, St. Paul wasn't one of the Twelve, but claimed the title of Apostle (for he certainly fulfilled that role), and that was acknowledged and accepted by the Eleven. So, having been an Apostle, St. Paul was automatically a bishop.
thanks for the reply. I believe Matthias was an apostle chosen to replace Judas. I never have seen in the scriptures where apostles were bishops. That is what I was wondering!
Good night and I hope you have a wonderful mass!!