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Because if all the factors are prime, the factorization can't be broken down further.

Consider some factor strings for 210:

2 x 105

2 x 3 x 35

2 x 3 x 5 x 7

The last (and longest) is the prime factorization.

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12y ago

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More answers

It's not. One isn't a Prime number.

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10y ago
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Q: Why is 1x1x2x1x3x1x5 the longest string of prime factors?
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