One is a factor of all nonzero numbers.
All numbers with 12 as a factor have 2 as a factor, but not all have 10 as a factor.
Yes. All even numbers have 2 as a factor.
2 is a divisor of all even numbers, and a divisor is a factor of all numbers which can be divided by it.
Yes. Factors are just numbers. All numbers have factors.
All whole numbers yes
Even numbers
No. 4 is not a factor of 6. Also, 6 is not a factor of 4.
All prime numbers have a common factor of 1.
All even numbers greater than 0 have 2 as a factor.
It can be. Two is a factor of all even numbers.
No.