give reason why 257 isn't perfect square
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Answer:
257 is not a perfect square as it contains the ones digit as 7 (units/ones digit of numbers containg 2,3,7,8 are never perfect squares).
Answer:
First number which is given is 257, this number has the last digit 7 which is not the last digit of any square of number. Second number is 4952, this number is also for the same fact ended with 2 which is not the last digit of square of any number.