2 is the only number is that both a factor of 2 and a multiple of 2.
Because 2 is a factor of 4. If a number is a multiple of four, when you add that it is a multiple of 2 there is no extra information, no additional factor.
6 is a factor of 30 and a multiple of 2.
2
2 is a factor of 14 but not a multiple of 7.
2 is a factor of 18 and is not a multiple of 3.
No. Any multiple of 4 is automatically also a multiple of 2. This is because 2 is, in turn, a factor of 4.
The only prime factor of 4 is 2. No prime number is a multiple of 5.
11
There is no such number. If a multiple of 4 is a factor of 30, then 4 must also be a factor of 30, but 4 is not a factor of 30 (the factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30), thus no such number exists.
6
10 is a factor of 20 (10 * 2 = 20) and is a multiple of five (5 * 2 = 10).