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It isn't clear what you mean with "looks like prime". What would your criteria be to "look like a prime"? The first prime numbers are:2, 3, 5, 7, 11, 13, 17, 23, 29, 31 ...

Other positive integers (larger than 1) are composite numbers. The number 1 has a special role, as the identity element of multiplication. It is neither a Prime number nor a composite number.


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9y ago

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It is 1 which seems like a prime number but it's neither a prime number or a composite number because it has only one factor which is itself.

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9y ago
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One.

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8y ago
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Q: What is the smallest number that looks prime but really isnt?
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