42, 84, 126, 168
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By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
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.
Just 32.
There are 35 prime numbers less than 150.
There are 15 prime numbers less than 50