Not a square
Fill each of the 12 cells with a digit so that the two four-digit numbers that you can read across, the two four-digit numbers that you can read down, the two two-digit numbers that you can read down at the sides and the two-digit number that you can read across at the bottom are all different perfect squares (with no leading zeros). Only the two-digit number that you can read across at the top is not a perfect square. What is that two-digit number?
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