Of course it is. If you have patience, your site can be listed on every major search engine and directory at no charge.  Search engines send out bots (or spiders) which traverse the Web following hyperlinks from one page to the next, gathering information and adding it to the search engines’ databases.
If your site is listed on any Web page that is already indexed, then it will eventually be “spidered” and added to Google, AltaVista, MSN, Teoma, AskJeeves, AllTheWeb, and others. Once Google indexes your site, your site will appear in the search results of all the portals and search engines with which Google has a syndication relationship. These including AOL, Netscape, Go.com, Alexa, iWon, Earthlink, and CompuServe.