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**The greatest 6-digit no is 999999**

**Now finding the square root of 999999**

**we get,**

**√999999=999.9995**

**Now since we need a perfect square**

**We find the square of the no 999 without considering the decimal places,**

**So now we have,**

**⇒999×999=998001**

**So, the greatest 6-digit number which is a perfect square is 998001.**

We find the square root of 100000 : = 316.227766 We take the next larger whole number 317, We square 317

317² =

**That's the smallest perfect square which is a 6-digit number, because when we square 316 we only get 99856, which is only a 5-digit number.**

*100489*