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They are one of your unique and permanent Steam IDs.
No.
I wouldn't post the Quick Invite link publicly, though. Depending on where it's placed, you could find your friends list filled with a lot of unknown people. Send the Quick Invite link to someone you trust privately.
мой код друга: 4002382713IH
I would recommend steam to use a different way instead of having that number or at lest have it change every use that sounds like it would be a little more safe