The least number which is a perfect square and has $540$ as a factor is

8, 100

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6, 400

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4, 900

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3, 600

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Solution

The correct option is B $8, 100$
The number must be a product of $540$ and another number.
$540 = 9 \times 4 \times 15$
Now, the least number to be multiplied with $540$ is $15$ to make it a perfect square.
So, the required number is $540 \times 15 = 8100$

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