6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, 96 are all the numbers that 6 factors.
12, 18, 20, 28, 32, 44, 45, 50, 52, 63, 68, 75, 76, 92, 98, 99 have exactly six factors. Many others have more.
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They are all the prime numbers from 2 to 97 that have only two factors
They are all the numbers except 79 83 89 and 97 which are prime numbers because they have only two factors.
2 and 5 are the prime factors of 100.
All of them except 97 which is a prime number because it has only two factors which are itself and one.
100