Which of the following numbers are not perfect square?

2397

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121000

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25008

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19640

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All of above

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Solution

The correct option is A All of above
These all are $n o t$ perfect square numbers because perfect square numbers always ends with $(0, 1, 4, 5, 6, 9)$ and if if last digit is $0$ it should be even number of zeros.
Therefore all the given numbers are not perfect square.

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