No, according to this post by Michael Covington. (LvSA)
A newly discovered fragment of the Book of Revelation challenges the conventional belief that the Antichrist's mark is 666, indicating instead that it is 616. Expert classicists used multi-spectral imaging to get a better view of the text, which is written in archaic Greek and dates to the late third century.
Obviously, if two potential Antichrists arise, with competing numerals, this issue would then become a matter of the utmost urgency. Until then, not.