You will see a label that explicitly says followed by the number. Method 4: Using Third-Party FBID Checkers
If you are using a WordPress plugin to show your Facebook feed, it usually requires your numerical ID. find my fbid
Finding the ID for a business or fan page is even easier than a personal profile. Navigate to the Page. Click on the tab. Scroll to the very bottom of the "Page Info" section. You will see a label that explicitly says