Does Google treat .af (Afghanistan) as an international domain though? Not sure if they take the TLD into account much anymore when determining the regional focus of a page, I know some TLDs like .io and .ai are treated as non-regional, not sure about .af though. Problably not a large problem though, just haven't seen many .af product sites so far (really great, short domain name otherwise).
Er, no. In English, it does not mean anything at all.
"Prime" is the analagous English word, I would think, and it is not a superlative. One would not say "that's prime" of something good, impressive, whatever.
"Prime" means: ready; in the thing's initial state; available for immediate use.
It also has a meaning in maths, but that's not really relevant.