What is the largest 4 digit number that is a perfect square?

9999

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9801

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9998

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9997

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Solution

The correct option is B 9801
On applying Long division method of finding the square root of the largest four digit number 9999,

$(99)^{2} < 9999$ by $198.$
$∴$ Greatest 4 digit number that is a perfect square = 9999 - 198 = 9801

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