Question

The sum of squares of all decimal digits of a number is a perfect square

Answer 1

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If a number is to be a perfect square then its digit sum must be 1, 4, 7 or 9. If its digit sum is not one of these numbers then it definitely is not a perfect square. However if its digit sum is one of these numbers it may be but is not necessarily a perfect square..

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Answer 2

Step-by-step explanation:

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If a number is to be a perfect square then its digit sum must be 1, 4, 7 or 9. If its digit sum is not one of these numbers then it definitely is not a perfect square. However if its digit sum is one of these numbers it may be but is not necessarily a perfect square..

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