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No, zero is not the smallest single didget number. There negative single digit number from -1 through -9
2 Answer: Without getting into the whole is zero a number or not debate, any of the numbers 0 to 9. (If you consider zero to be not a number then it's 1 to 9).
Divide the two-digit number by the one-digit number. If the remainder is zero then the 2-digit number is a multiple and if not, it is not.
The smallest four-digit number not using zero is 1000. In a four-digit number, the first digit cannot be zero, so the smallest possible value for the first digit is 1. The remaining three digits can be any number from 0-9, so the smallest possible four-digit number is 1000.