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Answer :
We know that the numbers ending with 2, 3, 7 or 8 are not perfect squares because they don't exist at the end of any square number.
(i) 153 is not a perfect square number because it ends with 3.
(ii) 257 is not a perfect square number because it ends with 7.
(iii) 408 is not a perfect square number because it ends with 8.
(iv) 441 is a perfect square number.