The next whole number is 9,999 plus 1 = 10,000
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9 999 999 999
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
The largest 3-digit number is 999. To check if it is a multiple of 3, you can sum the digits: 9 + 9 + 9 = 27, which is divisible by 3. Therefore, 999 is the largest 3-digit number that is a multiple of 3.
999 is a composite number because its factors are 1, 3, 9, 27, 37, 111, 333, and 999.