While these codes do exist in the source code, they do not represent profile views. Facebook engineers have clarified that these numbers usually reflect:
Proponents of this method claim that the numbers that follow these codes are the Facebook IDs of the people who visit your page most frequently. can you see who viewed your facebook profile
While you cannot see who viewed your profile, you can see how your content is performing. While these codes do exist in the source
It is purely a reflection of engagement, not passive viewing. If you never interact with someone, but they view your profile every day, they will not appear in this code. can you see who viewed your facebook profile