Example: 210
210
105,2
35,3,2
7,5,3,2
13 is a prime number. It doesn't have a tree because its only prime factor is itself.
prime factors
by using a prime factor tree
991 is already prime. No tree is required.
83 is prime. No tree.
Itself because 2 is a prime number
11 is prime. No tree. 25 5,5
23 is already prime; it doesn't need a tree.
23 is already prime; it doesn't need a tree.
Since 61 is already prime, a factor tree is not necessary. The prime factorization of 51 is 3 x 17, which wouldn't make much of a tree. More like a factor shrub.
IT IS PRIME there is no factor tree
The purpose of a factor tree is to notate the process of finding the prime factorization. If a number is already prime, a factor tree is not necessary.