'29' is a prime .
The other are composite
9 = 3 x 3
22 = 11 x 2
27 = 9 x 3
'29' being a prime , cannot be split up like the other numbers.
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29 is the next prime number after 27. But 27 is not a prime! 3 x 9 = 27!
The numbers 13 and 29 are prime - the one composite number in that list is 27.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 29 is prime.
25 = 5 x 5 27 = 3 x 9 29 is prime
23 and 29 are prime numbers