# Q.2 Write five numbers which you cannot decide just by looking at their units digit (or units place) whether they are square numbers or not.

The five numbers can be :- 521, 655, 124, 729, 1940 etc.

Basically, numbers ending with 0, 1, 4, 5, 6 or 9 at units place can be square numbers.

Any natural number ending in 0, 1, 4, 5, 6 or 9 can be or cannot be a square-number. Five such numbers are:

56790, 3671, 2454, 76555, 69209

Property 2. If a number has 1 or 9 in the unit’s place, then its square ends in 1.

For example:

(1)2 = 1, (9)2 = 81, (11)2 = 121, (19)2 = 361, (21)2= 441.

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