The simple answer is no – search engine submission isn’t necessary. The majority of search engines nowadays (most notably Google) crawl and index pages by following links. Using that logic, a single inbound link from any already-indexed page will identify your page to the engine. Subsequently, if that page links to other pages within your site, they will also be indexed… and so on.
For this reason, backlinks is very important. In fact, acquiring backlinks may be the most important of SEO. In theory though, a website owner shouldn’t have to ’scout’ or ‘hunt’ for links. If the presented content is of interest, useful, and/or important, there is a natural tendency among web users to link to information. This is the basis for the Google PageRank algorithm.
With all due respect, submitting your site to the search engines can’t hurt. Plus, it can speed indexing up if your are just starting out.
Would you ever consider going on a vacation across the country without bringing a map? It is hard enough to find your way in some places with a map. How hard would it be if you tried this adventure without one? Yet, this is exactly what people do every single day in the online world. They tried to build their own businesses online without having a roadmap to success. Then, after months or years of just wandering around online, they give up in frustration and quit. They walk away saying that the Internet doesn’t work for them. The reason it didn’t work is that they didn’t pick up a map and follow it! Need more backlinks… we have the backlink tools to help with your page rank.