9998
10000
That is 9998.
9998
9998
It is 9998.
9998
10001 and 9999, possibly.
Exactly as in the question 9999
10,000 (ten thousand) comes after 9999
9999 to 10004
No, the roman numeral for 9999 would be (IX)CMXCIX. In written roman numerals the (IX) in parentheses would have a bar on top. This denotes multiplication of 1000.
9999