253
11,23
Not much of a tree. More like a factor shrub.
253 11,23
253 11 x 23 Both 11 and 23 are prime numbers, so the factor tree is complete.
(1, 253) and (11, 23)
It's 35
214 2,107
The factor tree would be hard to show so here is the prime factorization.41 times 5
99 33,3 11,3,3
a factor tree
30 15,2 5,3,2
261 87,3 29,3,3
1162 581,2 83,7,2
68 34,2 17,2,2