The largest 3-digit number - not itself a perfect square - is 999. Calculate its square root, round the answer down, then square the answer again.
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Think of the largest number you can. Then square it. Then square that one. Since numbers don't stop, squares don't stop either.
32,768
121As 100 = 102 then the next largest square number will have to be 112 which is equal to 121.
266, 267, 268
grahams largest number is 92