A "perfect square" is a number that can be made by multiplying two copies of the same number together. For example, 4 is a perfect square because it can be made by multiplying 2 by 2. Full definition
You might not be able to get perfect squares for each slider, but that's ok, you can put a couple of leftover ends together into one slider. (thestingyvegan.com)
Also, don't worry too much about making perfect squares or lining them up exactly. (tworedbowls.com)
If the count is 95, the nearest perfect square is 100 and the square root is 10. (elearningindustry.com)