Yes.
Bigger numbers make bigger factor trees, and of course there are prime numbers which cant be factored at all
All whole numbers yes
All whole numbers have factors.
One.
It is not possible to express something as a sum of whole numbers with no common factor. All whole numbers have at least 1 as a common factor.
1
Two is a factor of all even numbers.
All whole numbers except for -1, 0 and 1 have at least one prime factor.
Yes, 5 is a factor of all whole numbers ending in 5.
Only 1.
One.
Yes. Five is a factor of all cardinal (whole) numbers ending in five