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How can you tell if 53 is a prime number?

Updated: 8/19/2019
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9y ago

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The square root of 53 is between 7 and 8. If 53 was composite, half of its factors would be less than its square root. By the rules of divisibility, we know that 53 is not divisible, by 2, 3, 4, 5, 6 or 7. It has to be prime.

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9y ago
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Q: How can you tell if 53 is a prime number?
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