You need at least two numbers to find a GCF. If that's 12 and 8, the GCF is 4.
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It would be 4.
If a number has equal factors, it is a perfect square and the equal factors would be square roots.
No it is not. 22 is not a perfect square because it is not a product of a rational number multiplied by itself. The closest perfect square would be 25
The GCF (greatest common factor) would be 21.
It is: 4