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Odd one out

In the following list of five numbers I have consistently replaced digits by letters, with different letters being used for different digits: CAST THE ODD ONE OUT. All but one of those five numbers is a perfect square. What is the numerical value of the odd one out?

WIN £15 will be awarded to the sender of the first correct answer opened on Tuesday 29 May. The Editor’s decision is final. Please send entries to Enigma 1695, New ÐÓ°ÉÔ­´´, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).

Answer to 1689 What’s my number?: Amy=6, Bob=7, Carol=8

The winner Terry Lovekin of Scarborough, Ontario, Canada