Didn't you notice the URL that is used when you click on one? For example
So that is sending *BACK* to the server *ASKING* for "/page/4".
More than likely, what is actually happening is that there is a URL REWRITE rule in place (look that up) and you are actually hitting something like
(It's not exactly that...I tried it. But check out what happens if you use
or some other number
so I'm on the right track.)
So this is 100% server-side pagination. Period.