Answer:
2
Explanation:
2 is smaller then 4, and therefore cannot be a multiple of 4. but as 16 is divisible by 2, it's also a factor of 16
2 is a factor of 16 but not a multiple of 4.
You can multiply 2*8 to get 16, making it a factor, but you cannot multiply 4 by a whole number to get 2.
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