pr ?
 

Quick question:
Whenever I type in my domain using www.mydomain.com my site shows up as a pr3 but without the www pr 0, how does this happen? I'm a newb when it comes to SEO so if this is a stupid question I apologize in advance.

google considers www.yourdomain a different domain/url than yourdomain.com, welcome to the internet

www. is just a subdomain as is whatthefuckever.domain.com

your links go to the subdomain so...
should answer the question