7 itself
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No.
4, 8, 12 and s on, in an infinitely long sequence. There is not enough time in the life of the planet earth to list all.
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All multiples MUST be multiples of 4.
All multiples of 4 are multiples of 2 and 4.
Yes, All multiples of an even number are themselves even. 4 is an even number, so its multiples are all even.
Yes. In fact all even numbers (not just 4) will share their multiples with 2.
The common multiples of 11 and 4 are 88, and 4.