Because 55 is an odd number. All the factors of odd numbers are odd.
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Common factors of 55 and 75 are: 1 and 5.
55 Divide by 5. 11,5 Stop. All the factors are prime. 5 x 11 = 55
2 + 53 = 55
true odds -55%
Yes. 55 is a composite number and it is divisible by 1, 5, 11, 55