471 can be divided by 3 ==> composite number.
This is an easy prime because if you make a sum of all the digits: 4 + 7 + 1 = 12, if you can devide this sum by 3 than you can also divide the original number by 3, else you can't devide this number by 3.
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It is prime
86 is not a prime number, so is a composite.
No 168 is not a prime number it is a composite number
composite
It is a composite number.