The bottom branch of a factor tree consists entirely of prime numbers.
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Prime numbers don't have factor trees. So if you can create a tree, your number's composite.
If completed correctly, the bottom branch of a factor tree will be the prime factorization of the number at the top.
Their at the bottom of the tree because the hole point of a factor tree is to find the prime factorization of the number, so it would be at the bottom of the tree.
A factor tree of number is (I think) the numbers that multiply together to form a product. They are prime numbers, too.
No, because it isn't prime.