What number should be added to a number to get a perfect square?

Answer 1

Because numbers are infinite, there is an infinite number of answers.

e.g. What number should be added to 2 to make a perfect square?

2+2=4 (a perfect square)

2+7=9 (a perfect square)

2+14=16 (a perfect square)

2+23=25 (a perfect square)

etc...

Did you have a specific number in mind.

Answer 2

Here is how you can calculate that.* Take the square root of your number.

* Round that up to the nearest integer. That's your perfect square.

* Subtract that number, minus your number, to find out how much you need to add.