In the multiple number of Greek manuscripts of the book of revelation, there are two different numbers stated as the mark of the beast: 606 and 666. There is only one explanation which accounts for the variation, and which also provides a contextual answer: in Hebrew numerology (rather than Roman or Arabic numerals), the name Caesar Nero has a combined value of either 606 or 666, depending on how you write the name in Greek. This is why the text says "the mark: that is, the name of the beast or the number of its name."
The entire book of revelation is a subversive religious and political tract against the Roman Empire, disguised in Jewish mythology and allegory. In fact, whenever the author says "this calls for wisdom: let him who has understanding," it is a rhetorical cue to indicate allegorical meaning.
So, while this microchip or any particular invention of an increasingly authoritarian government may be disturbing, it is not the fulfillment of a prophecy: Revelation was a letter to the churches of Asia minor, and to the extent that it was an accurate foretelling, the empire to which it referred collapsed a long time ago.
