# <span lang="EN-US

Given, a number as 4000.

Need to find out the least number which must be subtracted to make it a perfect square.

Now, using by division method we get

That means if we subtract 31 from 4000 we get perfect square

4000-31 = 3969.

= 63.

Hence, 31 must be subtracted from the given number to get a perfect square

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