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There is no such number. Any Prime number raised to the third power has exactly four factors. For example, 23 = 8; its factors are 1, 2, 4, 8 (1, 2, 22, 23). Since - as is well-known - there is no largest prime number, there is no largest number that has exactly four factors.

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βˆ™ 12y ago
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βˆ™ 14y ago

Just look for one that the squares are prime numbers... for example 4 is 2x2. 2 are prime.

So next should be 3

the factors of 9 are 1, 3, 9

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βˆ™ 8y ago

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Q: What is the next number after 6 that has exactly four factors?
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