2 x 5 = 10
2 x 7 = 14
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10 = 2 × 5
Prime factorizations are expressions of numbers as products of prime factors. The prime factorization of 30 is 2 x 3 x 5.
Prime factorizations are unique. No other number will have exactly the same number of prime factors as 28. Multiples of 14 will have some of the same factors.
Negative numbers don't have prime factorizations.
2 is already prime; no factorization.