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A digital root of a perfect square can only be 1, 4, 7 or 9. Which of these can NOT be a perfect square?

Class 8Parity, Remainders and Digital RootsNumber System

A961
B2345
C1444
D1296

Step-by-Step Solution

2345 → 14 → 5, which is not 1, 4, 7 or 9, so it cannot be a square. The others are

3 8^{2}, 3 1^{2}

and

3 6^{2}

.

Answer: B) 2345

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