There is no such number.
119 must be taken away from 519 to make 400.
you make a square number by multiplying a number times itself.
Select the other number so that it is bigger than the square number!
Because, 6x6=36. A square number is a whole number times itself.
All numbers can make a square. Every real number makes a positive real square. Every rational number makes a rational square. Every integer makes a perfect square.
To make money at the adoption centres.
1,4,9,25,36,49,64,81,100................
Square it.
If we make 12 the first square number then the seventh square number is 72 = 49. And, 100 > 49......so the answer to the question is yes.
45*45 = 2025
81 - 7
You could use the 3 stick to make the number 4 which is a perfect square.