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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?

WIN £15 will be awarded to the sender of the first correct answer opened on Tuesday 25 August. The Editor’s decision is final. Please send entries to Enigma 1555, New ÐÓ°ÉÔ­´´, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).

Answer to 1549 Same four digits: My three perfect squares are 26244, 42436, 43264

The winner C. J. T. Fews of Brislington, Bristol, UK