Which of the following can be a perfect square
1. ABC86
2. 1X2975
3. AB56
4. B36
5. AB9
6. AOB
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The perfect squares are the squares of the whole numbers: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 … So, from above given numbers, 1, 36, 49, 81, 169, 625, 900 and 100 are perfect squares. If the last digits of a number is 5, its square ends in 5 (in fact, the last two digits must be 25).
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