No, but vice versa holds true.
Case and point:
6 is a multiple of 2, but not a multiple of 4.
8 is a multiple of 4, and is a multiple of 2.
Because a factor of 4 is 2, every multiple of 4 is also a multiple of 2. But since 4 is not a factor of 2, rather, only half of it, only half of the multiples of 2 will be multiples of 4.
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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.
Yes. It's also a multiple of 1, 2, 16, and 32.
1 is a factor of 4 that is not a multiple of 2.
No, 90 is a multiple of 2 and 5, but not 4.
No. 2 is a factor of 4. 4 is a multiple of 2.