Matt Cutts, Google search spam head, recently released a new video in which he debunks the myth that having more pages will cause your page to rank higher.
He stated, “I wouldn’t assume that just because you have a large number of indexed pages that you automatically get a high-ranking. That’s not the case.”
With this in mind, he did go on to elaborate that having more pages is still a good thing. More pages leads to more keywords, more long-tail ranking opportunities, more content to be linked/shared. These factors will end up affecting your rank. So while the page number itself plays no role, the benefit of having more pages will.