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549 is composite, because it is divisible by 1, 3, 9, 61, 183 and 549. A Prime number may be divisible only by 1 and itself.

The sum of the digits in 549 equals 18. which is divisible by 3. That means 549 is divisible by 3 in addition to 1 and itself.

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Q: Is 549 composite or prime
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