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If factors include 1 and the number itself then the any number (n) with only 4 factors has to be the product of two prime numbers, p1 and p2.

The factors are then n, p1, p2, and 1.

The largest 3-digit number with only 4 factors is 998. The factors are 998, 499, 2 and 1

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Q: What is the largest three digit number that has four factors?
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