Write five numbers which you cannot decide whether they are square just by looking at the unit’s digit.

Monjur Alahi

Write five numbers which you cannot decide whether they are square just by looking at the unit’s digit.


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Salim Ahmed Kawsar

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Any natural number ending with 0, 1, 4, 5, 6 or 9 can be or cannot be a square number. 

Hence, 

The five examples are: 

(i) 2061 

The ending digit is 1. Hence, it may or may not be a square number 

(ii) 1069 

The ending digit is 9. Hence, it may or may not be a square number 

(iii) 1234 

The ending digit is 4. Hence, it may or may not be a square number 

(iv) 56790 

The ending digit is 0. Hence, it may or may not be a square number 

(v) 76555 

The ending digit is 5. Hence, it may or may not be a square number

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