The closest square number will be as close to 9999 as you like.
For example, 99.999 square = 9999.800001 (0.800001 away)
99.995 square = 9999.000025 (0.000025 away)
You could get closer still.
The nearest PERFECT square, however, is 10,000.
82 is not the square of an integer. The closest square number of an integer is 81, which is equal to 9 squared.
An infinite number of ways. 99+9/9 (99+9/9)*9/9 (99+9/9)*99/99 (99+9/9)*999/999 (99+9/9)*9/9*9/9 etc
6 9
999 + 999/999
8,999,999,999,999,999,999,999,999,999,999,999,999,999,999,991 (8 quattuordecillion, 999 tredecillion, 999 duodecillion, 999 undecillion, 999 decillion, 999 nonillion, 999 octillion, 999 septillion, 999 sextillion, 999 quintillion, 999 quadrillion, 999 trillion, 999 billion, 999 million, 999 thousand and 991)
The positive square root of 80 is approximately 8.94. Since 8.94 is closest to 9, the number closest to the positive square root of 80 is 9.
9
82 is not the square of an integer. The closest square number of an integer is 81, which is equal to 9 squared.
9 (92 = 81)
9 999 999 999
9, 010, 000 comes one after 9, 009, 999.
It's over 999 docilion, 999 nonillion, 999 octilion, 999 septillion, 999 sextillion, 999 quintillion, 999 quadrilion, 999 trillion, 999 billion, 999 million, 999 thousand, 999. And that's the biggest number I know.
999 = 9*103 + 9*102 + 9
729 27 x 27 = 729 9 x 9 x 9 =729
9/999=0.09009 10/999= 0.001001
999 is a three-digit multiple of 9
1 000 000 000 - 1. this is 999 999 999.