?Is the number 549 prime or composite? Explain why.
?
A. ?It is prime, because all the primes less than 24 will not divide evenly into it.
B. ?It is composite, since the sum of the digits is divisible by 9; hence 9 is a factor.
C. ?It is composite, since 7 will divide evenly into 49.
D. ?It is prime, because the primes: 2, 3, 5, and 7 will not divide evenly into it.
E. ?It is composite, since 49 is a composite number.
Answer: B
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