1000 because there are ten possibilities 0123456789 and there are four slots but the first slot has to be zero so it is 10 times 10 times 10 times 1
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If there is a decimal placed somewhere within the number, such as .3568 could be rounded to .357
A four digit whole number can be found from 1000 to 9999
The number is 9376.
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.
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.