Link factors include that portion of the Google algorithm that determines page importance, which in turn is primarily dependent on PageRank (PR) – the quantity and strength of links that point to your site . However, the concept of link quality is also an important factor, which is not part of the PageRank calculation.
You can check your website backlinks via:
1. Go to Google and search – link:www.your.domain.com
2. Sign up in the Google webmaster Tool then add and authenticate your website.