The largest four digit whole number that is a multiple of 7 is 9,996.
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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 largest four-digit prime number is 9973.
9999
9876 is the largest four digit number you can make if all the digits must be different.
113 x 88 = 9944 The highest four-digit number divisible by 88 is 9944.