Question

find the smallest whole number by which 1620 is multiplied and to get a perfect square​

Answer 1

By prime factorisation of 1620, we get

1620 = 2 x 2 x 3 x 3 x 3 x 3 x 5

Here, 2 and 3 are in pair, but 5 is not in pair. Thus, by eliminating 5 from 1620, obtained number will be a perfect square.

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

Thus, Answer = 5

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