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

Question

Write five numbers which you cannot decide whether they are square just by looking at the unit&#x2019;s digit.

Philoid · Accepted Answer

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