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No, It's not a Prime number. As 7 * 37 = 259. It's worthnoting that both 7 and 37 are prime numbers. To detect whether a no. is prime no. or not first find it's Square root. e.g. for 259 , sqrt(259) = 16.09 Then divide 259 by any no. less than 16.09 (e.g. between 1 to 16). If the no. that is 259 in this case is divisible by any of them then definitely it's not prime no. This method leaves you with less no. to check for divisibility of the concerned number like in this case is 259.

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Q: Is 259 a prime number
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