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Which of the following square numbers ar...

Which of the following square numbers are squares of even numbers ? 121,225, 256, 324,1296, 6561, 5476, 4489

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`256`, `324`, `1296` and `5476` are the squares of even numbers.
`sqrt 256=16`
`sqrt 324=10`
`sqrt1296=36`
`sqrt5476=74`.
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