In a word, no. Caffeine is an integral part of the tea leave's chemistry. Due to matcha's powder form you cannot separate it as you would with regular tea leaves. Decaf green tea is achievable by either harsh chemical processes which are damaging to the teas quality.
A composite factor is a factor that is a composite number, asopposed to a prime factor which is a factor that is a prime number. A factor is a number or quantity that when multiplied with another produces a given number or expression.
A natural number which has only 2 factors - itself and 1. 23 has only 2 factors: # 23 = 1 xx23# There are no other natural numbers which are factors. #23# is therefore a prime number. If it had 3 or more factors it would be composite. 1 is the only number which has 1 factor - it is neither prime nor composite.