1009
6 is.
6
1155
9409.
This depends on what you mean by smallest. The smallest four-digit whole number is 1,000; the smallest four-digit real number is .0001 (1/10,000); the smallest four-digit integer is -9,999.
That would be the same as the smallest four-digit even number: 1,000, which also happens to be the smallest four-digit whole number.
The smallest four digit number is 1000. It is even so 1001 is the smallest four digit number that is odd.
If you allow non integers, then your smallest four-digit number would be .0001. If you only allow integers, then your smallest four-digit number would be 1000. Your largest four-digit number would be 9999.
The smallest four digit whole number is 1000.
The smallest four digit whole number is 1000.
1000
10, which has the factors 1,2,5 and 10. If the trivial pair 1 and the number itself are disallowed, the answer is 12 with factors 2,3,4 and 6.
Provided that the first digit cannot be 0, 1000 is the smallest number with four digits. Otherwise there are smaller numbers with 0 to thousandth digit such as 0100, 0050. The smallest integer in such instance is 0000.
1009
1000
32