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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.
549/36 = 15 r9
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