1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 192
2 and 3 are prime.
1, 3, 5, 15, 25, 75, 125, 375
3 and 5 are prime.
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375 125,3 25,5,3 5,5,5,3
Other than one and itself, 395 has only two factors, 5 and 79 (both are therefore prime). Prime factorization of 395: = 5 x 79 5 is the first prime that divides into 395 evenly, 79 times. 79 is itself prime, so that's as far as you can go!
450 = 2 x 3 x 3 x 5 x 5
Prime factors are factors that are also prime numbers.
3 x 5 x 5 x 5 = 375