1272 Divide by two.
636,2 Divide by two.
318,2,2 Divide by two.
159,2,2,2 Divide by three.
53,3,2,2,2 Stop.
2 x 2 x 2 x 3 x 53 = 1272
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The purpose of a factor tree is to divide a number into prime factors. 1 is not a prime number.
19 is already prime; no need for a tree.
No because you have to have a prime number besides 1 like 2,5,7 because every time you use a factor tree and you put a 1 as prime you keep getting one every time.So one can not be use as a factor when doing a factor tree.
When the bottom branch consists entirely of prime numbers.
The only name is factorization.