Google PageRank is a rank given by Google to measure importance of a webpage. The main factor that helps to increase the pagerank is backlinks.This is logically correct, because if most web pages linked to a particular page for a reason. Because that page is important /worth to link .

This point is ok with natural links , but paid links?? Google is going to crack this barrier also .

That’s why google going to crack paid links.

So the best way is to get good inbound links, Make your site important to others.

There are several ways to check Google Pagerank.You can install Google tool bar and enable it.

After install it you can enable or disable Google pagerank display option.

Google Tool bar => Settings=>option

After you enable it , you can check the pagerank of any site.