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Divide the number by each prime up to the prime that will go into the number leaving no remainder:

648/2=324

324/2=162

162/2=81

81/3=27

27/3=9

9/3=3

3/3=1

Listing each divisor as a prime factor, the prime factorization of 324 is 2x2x2x3x3x3x3 or 23x34.

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Q: How do you get the prime factorization of 648?
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