1800. That is, 900 positive values (100 to 999) and another 900 negative values (-100 to -999).
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There are 9000 4-digit numbers in hindu-arabic numeration system
9000
All the numbers from 100 to 999 have three digits, as do all the numbers from -100 to -999, so that's 1800 in total.
None. 3 digit numbers are not divisible by 19 digit numbers.
There are 21 two-digit prime numbers.