Question

The smallest number by which 392 should be multiplied so as to get a perfect square is ___

Answer 1

Answer: 625

$392=2\times 196$
$=2\times 2\times 98$
$=2\times 2\times 2\times 49$
$=2\times 2\times 2\times 7\times 7$
$=2^3\times 7^2$
$\therefore 392$ should be multiplied by 2 so that the product is a perfect square.