7 because 132 = 169
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69
31.
sqrt(2493) = 49.93 So the largest perfect square smaller than 2493 is 492 = 2401 Therefore, the smallest number to be subtracted is 2493 - 2401 = 92
It is 69 because 123 squared = 15129
The answer is 4, as 629 minus 4 equals 625. 625 is 25 squared.