9, 010, 000 comes one after 9, 009, 999.
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009 (9) is greater than 005 (5) by 004 (4)
999 is a three-digit multiple of 9
It is: 9
999 is a composite number. This is because composite numbers are any number that has more than two factors (one and itself). Therefore, since there are many factors of 999 besides one and itself such as 3, 9, and 27, that makes it a composite number.
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