Google's page rank will give you a general
indication of your website's "popularity".
It is just a general indicator that gets updated
from time to time.

Important is the number of relevant in-bound
links to your site. In general, the more links
the better.

For a more accurate account of your website's
popularity... there are a bunch of online tools
to measure popularity. Plus, you can always
check it directly by searching on "link:yourwww"
or "link:https://yourwww"

~Roland