Which are I am an odd composite number, the smallest one that has two different primes in its tree. Who am I
An even number multiplied by any number forms an even number. So you want the smallest odd prime numbers that are >1 (note: any number that is only divisible by 1 and itself is itself, prime) so 3 and 5. 3*5=15
This is most likely 16 as it is the product of 4 and 4. The prime factors of 16 are 2, 2, 2, and 2 and it's smallest composite number is 4.