Question

find the biggest number by which 3645 should be multiplied to get perfect square

Answer 1

3645=3×3×3×3×3×3×5

=(3×3)(3×3)(3×3)×5

05 is alone here...to make 3645 perfect square we multiply with 05..

3745×5=(3×3)(3×3)(3×3)(5×5)

=(3×3×3×5)^2

=(135)^2

This is your ans......