Get the latest tech news
Play Store update 'bugs' several Android users with recurring notifications
"Update Play Store" notification is being sent by several first-party Google apps.
Recently, Google went on a mass deletion spree and took down several apps on Play Store that were part of a massive Ad fraud that engulfed them. However, once users click on the notification they're taken to Google Play Store's home page, all in vain; since the apps don't show any update available to be installed. It is important to note that any troubleshooting steps that users have mentioned on Reddit threads are simply suggestions and aren't official guidelines to fix the issue.
Or read this on Android Central