I've read that both 666 and 616 refer to the Emperor Nero, is this true?

According to ChatGPT-5, "both numbers are thought to be examples of gematria ", which is a system where "letters also stand for numbers": Meaning the name of a person can be expressed as a number. However I've searched online and can't see how you can get to "Nero" from these numbers? Is it all pseudo-science? Again, according to ChatGPT-5: 666: Often interpreted as referring to Nero Caesar when written in Hebrew letters (נרון קסר = 666). 616: Matches the same name Nero Caesar but in a slightly different spelling (the Latin form without the final “n”: נרו קסר = 616). It concludes: "So both numbers likely point to Nero, the Roman emperor infamous for persecuting Christians." Does gematria really point both of these numbers to "Nero"?