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Yes exactly, imagine a function HH(n) that returns 0 if the Turing machine represented by the integer n halts, and 1 if it doesn't.

Then HH the function itself is not computable, but the numbers 0 and 1, which are the only two outputs of HH are computable.

Integers themselves are always computable, even if they are the output of functions that are themselves uncomputable.

Yes. A valid question for a specific n would be whether you can prove the value of BB(n). If you don't care about provability, you can indeed just produce a number that happens to be the right one.

So as you noticed, it only makes sense to talk about whether a function is computable, we can't meaningfully talk of computable numbers.

The main thing to make it clear is that BB(n) for a specific n isn't a function - it's a number. Just like Mult(10,4) isn't a function, it's a number (40).

So a specific BB(n) is just a number and is computable.