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## Answers

### This Is a Certified Answer

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**The answer is 99856 which is a square of +316 or -316.**

**Since**

**99856==2²*79=316.**

**And , we see that 99856 is the closest required number to 99999 , which is the largest 5 digit no.**

**So the required number is 99856**

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Note:This can be done in 3 different methods:

1>Prime Factorization

2>Trial and Error

3>Division

99856 is the greatest five digit number which is a perfect square.