87 = 3*29
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29x3 both prime so your done
A factor tree of number is (I think) the numbers that multiply together to form a product. They are prime numbers, too.
Prime numbers don't have factor trees. So if you can create a tree, your number's composite.
A factor tree is a representation of the process of finding the prime factorization of a given number.
If completed correctly, the bottom branch of a factor tree will be the prime factorization of the number at the top.