YouTube displays the number of users who have subscribed to your channel below each of your videos (next to the Subscribe button) and on your channel page. This setting is enabled by default, but if you would like to prevent the streaming platform from disclosing the number of subscribers, you can turn off the Subscriber Counts in your Channel Settings.
How To Hide the Number of YouTube Subscribers
Sign in to your YouTube channel, click on the Profile badge and then select Creator Studio. Go to the Channel section > Advanced:
Go to the Subscriber Count section and select Do not display the number of people subscribed to my channel: