the factor tree of 100
100
^
50,2
^
25,2,2
^
5,5,2,2
1111
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83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.
145 5,29 Not much of a tree. More like a factor shrub.
The purpose of a factor tree is to divide a number into prime factors. 1 is not a prime number.