The longest number that would also be the smallest would be the highest number counted to just made into its negative form.
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The smallest prime number is '2' (TWO).. It is also the only even prime number.
4, which is the square of the prime number 2, is the smallest composite number.
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.
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