No number under 100 has four distinct prime factors, but these might qualify...
2 x 2 x 2 x 2 = 16
3 x 3 x 3 x 3 = 81
2 x 2 x 2 x 3 = 24
2 x 2 x 2 x 5 = 40
2 x 2 x 2 x 7 = 56
2 x 2 x 2 x 11 = 88
2 x 2 x 3 x 3 = 36
2 x 2 x 3 x 5 = 60
2 x 2 x 3 x 7 = 84
2 x 3 x 3 x 3 = 54
2 x 3 x 3 x 5 = 90
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The prime factors of 100 are: 2, 5
30, 42, 66, 70 and 78.
1,2,4,5,10,20,25,50,100 2 and 5 are prime.
Each of the 25 prime numbers from 1 to 100 has exactly two factors, 1 and the number itself. The other 75 numbers from 1 to 100 are not prime numbers because none of them have exactly two factors.
2 and 5 are the prime factors of 100.