1x11 11 is prime. No tree.
11 is prime. No tree. 25 5,5
11. 121 = 11 x 11
The prime factors of 11 are 11 x 11.
22 2 x 11 Both 2 and 11 are prime numbers, so the factor tree is finished.
253 11 x 23 Both 11 and 23 are prime numbers, so the factor tree is complete.
11*19
12111, 11
61 is already prime. It doesn't need a tree.
A commonly used factor tree for 132 is: 132 11 12 11 4 3 11 2 4 3 Another factor tree for 132 is: 132 66 2 22 3 2 11 2 3 2 Yet another factor tree for 132 is: 132 66 2 33 2 2 11 3 2 2 Hey for the first factor tree 4 isn't prime
33 / \ 3*11
143 11, 13