Launch the Instagram app on your smartphone.
Image Source : FileGo to your profile and tap on "Followers."
Image Source : FileIf your Instagram identifies potential spam followers, you'll see a notification labelled "Potential spam."
Image Source : FileSelect "Remove all spam followers" to delete them in one go.
Image Source : FileTo mark an account as not spam, tap on the three dots (more actions) next to the account and choose "Not spam" to confirm.
Image Source : FileOnce removed, these potential spam followers will no longer appear in your follower count or list. They will not be notified of their removal.
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