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Math and Arithmetic
Prime Numbers

Is 147 a prime or composite number?


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February 11, 2017 7:49AM

147 is a composite number. Its factors are 1, 3, 7, 21, 49, and 147.
Note that the sum of the digits of 147 is 12. If the sum of the digits of any number is a multiple of 3, then the number has 3 as a factor. So sine 12=4x3, we know that 147 is divisible by 3 and that makes it composite.