The fact family for 81 has more than 2 factors: 1, 3, 9 are factors: and that is more than two!
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9 has three factors: 1, 3, and 9
Since 9 is a factor of 27, all of its factors are common.
The first three multiples of 9 are 9, 18 and 27. For them to be common, they need to be compared to another set of factors.
That's an infinite list. Numbers with three factors are the squares of prime numbers.
Common factors are one and three.