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Generally speaking, 500,000 views is considered to be semi-viral, while 1-2 million views or more is considered to be fully viral.
Because not all followers of an account will see every TikTok that a creator has posted (even if the creator has millions of followers themselves), reaching several million views on a video means that the video has gone viral even outside of their own circle. It has been pushed to hundreds of thousands (if not millions) of people’s For You pages, and has likely resulted in a lot of new attention to their account.
It should be noted that virality is a scale, so determining the exact number where you feel your video has gone viral will be unique to you.