Is a sitemap required for 3-4 page Google websites? Will it change that at all?

I just uploaded my new website to Google. Before working on a sitemap, I was wondering if you can see if I need a sitemap. Google has not yet indexed my website.

Do sitemaps have an SEO advantage at all, apart from making Google aware of your website? Would adding a sitemap to my website give me an advantage in terms of ranking or site location on Google search?

Thanks a lot!
Sincerely yours,