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Is 20 a prime number or a composite number?
Is 10 a prime number or a composite number?
Is 4 a prime number or a composite number?
Is 23 a prime number or a composite number?
Is 67 a prime number or a composite number?
Is 43 a prime number or a composite number?
Is 19 a prime number or a composite number?
Is 16 a prime number or a composite number?