378
189,2
63,3,2
21,3,3,2
7,3,3,3,2
126,196 and 378's highest common factor is 14.
253 11,23 Not much of a tree. More like a factor shrub.
Yes.
It's 35
214 2,107
378 2,189 3,63 3,21 3,7
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