Any Prime number greater than 11.
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237 is a COMPOSITE number. Since it is divided by 3 and gives a quotient of 79 (which is a prime factor of 237) and remainder as 0.
The answer is 51
Unless they are divided by themselves or one, they will always have a remainder.
A prime number is a number that can only be divided by 1 or itself. A composite number is a number which can be divided by a number other than itself or 1 and not leave a remainder. 178 divided by 2, for example, equals 89 (89 + 89 = 178). Since 2 is not dividing 178 by 1 or by itself and leaves no remainder, it is a composite number.
You know when you have a remainder once you have divided and all of the spots above the number being divided (the answer) have numbers. If you don't have zero by then, that last number is the remainder. If you want to figure it out without dividing, check a prime numbers chart.