All major search engines such as Google, Bing and Yahoo have primary search results, where web pages and other content such as videos or local listings are shown and ranked based on what the search engine considers most relevant to users. Payment isn’t involved, as it is with other paid search ads.
There is no magic number in terms of word count, and if you have a few pages of content on your site with a handful to a couple hundred words you won’t be falling out of Google’s good graces,
Google is increasingly weighting engagement and user experience metrics more heavily. You can impact this by making sure your content answers the questions searchers are asking so that they’re likely to stay on your page and engage with your content. Make sure your pages load quickly and don’t have design elements (such as overly aggressive ads above the content) that would be likely to turn searchers off and send them away.