Hai,
I watched kzk 2 on and off but my former colleague used to almost regularly. She once said Prerna divorced Bajaj and Anurag married her. Then I happened to watch few episodes post leap and then Bajaj was there with Prerna and they were introduced as 'Mr. & Mrs. Bajaj' . Anurag married her again in the temple in one of the last few episodes before the show went off-air. Did Prerna divorce Mr. Bajaj again? If she didn't how will her marriage with Anurag be valid as Mr. Bajaj was still alive by that time?
I don't think Bajaj Prerna marriage for the second time is a fake one because Prerna got visa to leave abroad and it's most likely that she left the country on her spouse' visa. Perhaps they didn't have a traditional marriage with mangal sutra, sindoor and all (I think so because Prerna didn't wear any when she's with Bajaj post leap) but a registered marriage is as good as or even more powerful than the traditional one. Right!
Also if Prerna was married to Mr. Bajaj for the second time she will be his widow by law after his death and can inherit a part of his property too! They could have shown Anurag marrying Prerna after Mr. Bajaj's death. It would have made some sense.
The same applies in case of Anurag also. He's legally married to Komolika so he can't claim another person as his legally wedded wife at least until the death of his spouse or a divorce from her. Clearly here Komolika died and he too became a widower. Marriage with Prerna only after this event would be possible.