2 is the only number is that both a factor of 2 and a multiple of 2.
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2
The only prime factor of 4 is 2. No prime number is a multiple of 5.
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.
3.
Any multiple of 30.