Based on what I see on my Steam Deck (not sure on Bazzite specifics), it looks like the WINE prefixes are stored in ~/.local/share/Steam/steamapps/compatdata
I think the number in each folder name is the game's steam ID, which makes it a bit cryptic. You can probably find that ID by running grep -i "name of game" *.acf in the steamapps folder. The files are named like appmanifest_STEAMID.acf, if I understand how this works correctly. You might also just be able to search for the file you're looking for directly though if you know what the name is inside the prefix and it's distinct enough.
Probably hundreds of millions or billions if you include things like washing machines, dish washers, automated gates, garage openers, etc. that automate specific tasks. Just the read/write arms in hard disks alone is probably a staggeringly huge number, if we're counting things like that...