It is 27 because it has more than two factors and therefore it is a composite number
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47, 29 & 37 are prime numbers while 49 is a composite number.
27 is.
27
999 is a composite number because its factors are 1, 3, 9, 27, 37, 111, 333, and 999.
They are: 61+67 = 128 or if you mean 29+37 = 66