How to see if a page is indexed

There are many ways to do this.

The first is see if you find it making a search.

You can use your browser and enter the site:your_website_url in the URL box. This should return a list of all the pages on your website that are indexed. You can even refine your site: search but that would depend in how you have named your pages. The link below explains how to do this.

If you are the owner of the domain the SERP will probably tell you that you can use Google Search Console

Google Search Console

I cover how to use GSC on another page.