Question

Find the smallest whole number for $1620$ by which it should be multiplied so as to get a perfect square. Also find its square root.

Answer 1

Given number = 1620

using prime factorization

$1620=2\times 2\times 5\times 9\times 9$

if above no. is multiplied by 5 then it will be perfect square.

$1620\times 5=8100$

&$\sqrt{8100}=90$