After an update, if a numeric badge appears on the Settings App icon, it is usually a prompt to indicate that a feature (such as Fingerprints or Wallet) still need to be set-up - the number in the badge indicates the number of items that need to be resolved.
To clear the badge, it is usually a simple action of opening the Settings App - and somewhere in the left-hard settings pane (scrolling up or down as needed) you will find a visible indicator as to which item needs attention. Opening the specific item is usually sufficient to clear the item. On rare occasion, an erroneous badge can be cleared with a forced-restart of the device.
Sorry, I can’t simulate and grab a screenshot to illustrate this - as this indication only generally appears after a major update or when setting-up a device as new.
I hope you find this helpful in guiding you to the offending setting(s).