None, they are all prime numbers.
27 is not a prime number.
No, 3451 is not a prime number. Its prime factors are 7, 17, and 29.
203 is a composite number. Its factors are 1, 7, 29, and 203.
27
The prime factorization is: 22 x 7
61 is prime 28 = 4 x 7 = 2 x 14 83 is prime 29 is prime
49 a prime number can be divided by only 1 and itself - 49 is also divisible by 7 (7*7=49)
27
A prime number is a number that is divisible only by 1 and itself; it has no other factors. The factors of 7 are 1 and 7. The factors of 13 are 1 and 13. The factors of 27 are 1, 3, 9, and 27. The factors of 29 are 1 and 29. Therefore, 27 is the only one that is not a prime number.
29 is the answer. 29 is prime. 2+9=11 which is prime. 9-2=7 which is prime.
21 is not a prime number because it is 3 x 7
91 is a composite number. The factors of 91 are 7 and 13.139 is a prime number13 is a prime number29 is a prime number.