Each song has its own copyright year.
There could be but most likely not. The Poptropica owners would have to get a copyright contract from The Beatles manager. That's a LOT of hassle.
Nowhere. All Beatles songs are still protected by copyright and are NOT available for free.
Nobody will tell me
The song is still under copyright; the lyrics can't be provided here.
Software is protected by copyright (as a "literary work"), but can also receive a patent if it is exceptionally innovative.
Not sure why you are asking this, but technically, every song is copyrighted the moment it is written whether or not it is registered with a copyright office. All of the Beatles' songs are registered. But even if one was not for some reason, the technical copyright is in place and the song is protected. The recorded performance is also copyrighted, as it says on the CD and records.
Most websites give the copyright year as the current year, because that's when the page rendered. See at the bottom of this page, Copyright [current year] Answers Corporation.
More likely Paul McCartney. "Let It Be" is a Beatles song, not a Lennon song.
Yes, the Beatles are on it
Very rarely. Rightsholders of copyright-protected content expect and receive royalties for most uses.
It does not cost anything to receive copyright protection in most cases. For a watch, you would need to seek out a patent to protect your product, not copyright.
Google gives the copyright date as the current year, because that's the date the page rendered.