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Divide your target number by prime numbers until all the factors are prime. Most people use some sort of diagram, like a factor tree, to help keep track.

210 Divide by two.

105,2 Divide by three.

35,3,2 Divide by five.

7,5,3,2 Stop.

2 x 3 x 5 x 7 is the prime factorization for 210.

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Q: How do find prime factor?
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