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The largest prime number under 20?

Updated: 12/13/2022
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14y ago

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The largest prime under 20 is 19.

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Q: The largest prime number under 20?
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What is the largest prime number that has a square root that is less than 20?

Prime numbers can't have whole number square roots, of course, but the largest prime number under 400 is 397.


What is the largest prime number between 20 and 50?

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A prime number can be less than 20, but it is not a requirement that the number has to be under 20 to be considered prime. Here is a list of all the prime numbers under 20: 2, 3, 5, 7, 11, 13, 17, and 19 .


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