They are members of the set of numbers of the form 28*k where k is a positive integer less than or equal to 7.
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No, 49 is a multiple of 7.
Yes, 84 is a multiple of 7 because 7*12 = 84
Yes, 84 is the 12th multiple of 7. i.e. 7 x 12 = 84
560 is a multiple of 7. It goes in 80 times. 91 is a multiple of 7. It goes in 13 times.
The only number that could be both a factor and a multiple is 7 itself.