All even numbers greater than 2 have even proper factors, since they all have 2 as a proper factor.
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If the two numbers have no common factors other than 1, the LCM will be their product. If there are other common factors, the LCM will be less.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
Just 32.
Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.