1122
561,2
187,3,2
17,11,3,2
2 x 3 x 11 x 17 = 1122
1997 is already prime; no tree.
23 in a factorization tree has only one number and that is itself because 23 is a prime number
by using a prime factor tree
51 3,17
350=2x5x5x7
33 11,3
a prime factorization tree
21
220 110,2 55,2,2 11,5,2,2
10 2 x 5
50 25,2 5,5,2
97 is already prime; no tree.