Alex Mills

Normally it is not possible to have a page slug (the page’s name in the URL) that is a number. For example this will not work: <code>yoursite.com/about/2/</code>. That URL conflicts with paged content feature where you can posts and pages with multiple pages of content by adding <code></code> within your content.
This plugin allows you to have pages with numbers as slugs by giving up the ability to have paged content pages which isn’t a big deal as most people don’t use paged content pages anyway.
Code contributions and bug reports are welcome via <a href="https://github.com/Viper007Bond/allow-numeric-stubs" rel="nofollow ugc">this plugin’s GitHub repository</a>.

Allow Numeric Slugs

Works with 5.2.2

Allows Pages to have a slug (URL) that is only a number. Sacrifices the paged content ability in Pages to accomplish it.

spinfly

When using /sample-post/ or /%postname%/ permalinks and a slug consisting of only numbers, WordPress incorrectly interprets this as pagination and doesn’t handle things correctly. This plug-in will send users to the correct post.

Numeric Slugs

Use post titles and slugs made of only numbers.

Allow Numeric Slugs vs Numeric Slugs