This is again urgent maths hw. please help me. thx

Find all three-digit even numbers N such that 693 xNis a perfect square, that is, 693 xN= k to the power of 2 where k is an integer

i am in yr 8. please explain in easy words...:P but answer it completly (i know im mean but wat u have dun will work) thx!

i get it and how it works but how did u get 693 = the factors 7,3,11. how did u get those 3 numbers?