Search Google for “info:domain.com” (without the quotation marks, replace domain.com with the domain that you want to check).
If there are no results or if the returned URLs don’t match the original URL then it’s likely that the PageRank has been faked. If Google returns only one URL for the query and if the URL is the same as the checked URL then the PageRank is okay.
Thanks POLiSH from DNF for the tip!
Also Here is a great site to check PR and a few other things about your website