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find the smallest whole no which it should be divided so as to get a perfect square also find square roots of the square no so obtained 2800 and 1620

2800 = 2 x 2 x 7 x 10 x 10

2800 needs to be divided by 7 to become a perfect square.

1620 = 2 x 2 x 3 x 3 x 3 x 3 x 5

1620 needs to be divided by 5 to become a perfect square