No It's not. Content of the site and On-site optimization is also play well.. And I'm not sure whether google take care about IBLs too..
In short, Just do Quality work work in on page as well as off page optimization to improve page rank.
do not bother about the PR much. concentrate on quality, unique content and frequent updation. this will improve your google ranking. will get more backlinks from other sites if you have high google rank with good content, which inderectly improves your PR
Backlinks, quality content both go hand in hand. Either build quality links or post quality content and wait until you get natural links and then you would get good PR in the next PR update.
Page Rank is determined by the quality of Incoming Links your website has got. Now, most people concenterate on increasing the quantity of Incoming Links reaching no where. However, if concentrated on quality of links, you can easily get High PRs within a small span of time
backlinks, backlinks, backlinks... relevant backlinks are the best, but use every link that you can get (no spam) because every link counts ;-) Nemanja
Were talking about increasing PR through backlinks but how can we get backlinks? Well maybe thru blog commenting, forum posting, article submission, directory submission, Press Release, Social Bookamrking, and Social Networking. If i still forgot some techniques please kindly add.
Simply by building LINKS especialy HIGH PR links But don't waste time with PR higher PR means nothing no higher traffic or rankings ...
First of all, as it was said before-Improve backlinks, you have to use links with high PR. But content of the site, its age, good titles, meta, and sometimes directory submissions plays its role too.