Yes. Create a sitemap of your site and submit it to Google Webmaster. Wait for a moment till your pages get to be indexed. It will take some time but atleast you will be sure of the result. Having a sitemap is good for a site.
When you do site:domain.com, it is NOT an accurate tool to measure how many pages on your site are indexed by Google. You need to use Google Webmaster Tools at www.google.com/webmasters/ to get a more accurate picture. Then, as has been suggested, create a Sitemap.