It is 7 because it is a Prime number
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56 = 2^3*7 so the only odd factors (apart of 1) is 7.
The number 7 is a factor of 7,14,21,28,35,42,49,56,63,70,77,84,91,98,105 or anything multiplied by 7.
One is a perfect square that is a factor of 7.
Prime. It is only divisible by itself and one.
1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 32, 36, 48, 72, 96, 144, 288 2 and 3 are prime.