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.
9
6 7
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
999 + 999/999
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.
9
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.
999 (assuming base ten mathematics)999.If you are allowed to use indices, then 9^(9^9) would be the largest. This equates to a very, very, VERY long number.