Could an antipope be the Antichrist, since a true pope cannot be?

There have been about forty-four antipopes in the two thousand years of Church history, most of them in the medieval period between roughly 1100 and 1400, when the secular world was closely intermingled with the papal world and kept the antipopes in check. It is very possible to have an antipope again, though today the secular world probably would not even notice. But there is only ever going to be one Antichrist, and if you already know he will not be a true pope, your question is essentially answered. You can have an antipope at any time, but whether that antipope is the Antichrist is a different question, because the Antichrist, according to 2 Thessalonians 2, is a unique man who exalts himself above every man who came before, claims to be from God as Jesus was, and works miracles to deceive. Paul says a worldwide apostasy comes first, and then, because the people refuse the truth, God sends a strong delusion and allows the Antichrist to lock them into their sin for judgment. So the Antichrist is a one-and-only figure and has really nothing to do with an antipope.