Any multiple of that number:
6561 x 0
6561 x 1
6561 x 2
etc.
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6561 = 6561.0 or 6561 = 6561/1
12
The numbers are being squared: 32 = 9 92 = 81 812 = 6561 65612 = 43046721
9^(4) = 9 x 9 x 9 x 9 = 81 x 81 = 6561
Converse:If a number is divisible by 3, then every number of a digit is divisible by three. Inverse: If every digit of a number is not divisible by 3 then the number is not divisible by 3? Contrapositive:If a number is not divisible by 3, then every number of a digit is not divisible by three.