Is there an established terminology for "a number with at least two distinct prime factors"?
These are the composite numbers 6 (2x3), 10 (2x5), 12 (2x2x3), 14 (2x7), 15 (3x5), ..., but not 4 (2x2), 8 (2x2x2), 9 (3x3), ...
These numbers are neither primes nor prime powers, but this describes them by what they are not; I would prefer a concise description of what they are, if there is an established terminology for it. If not, I'm tempted to foist the phrase "truely-composite number" onto an unsuspecting world :-)
I would be quite hesitant to introduce a nondescriptive name like 'truly-composite' (note spelling of truly). How about multi-prime composite if you really need a name.
Another way to think about these numbers is as the composites that are not the size of any finite field.