28 = 2 * 2 * 7 = 22 * 7
42 = 2 * 3 * 7
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21 isn't prime. The prime factorization of 42 is 2 x 3 x 7.
The prime factors of 42 are 2, 3 and 7.
The prime factorisation of 42 is 2*3*7.
The prime factorization of 42 is 2 x 3 x 7.2 x 3 x 7 = 422 x 3 x 7 = 42
The prime factorization of 42 does not use exponents: 2 x 3 x 7