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Yes, 30 is a composite number: its factors are 1, 2, 3, 5, 6, 10, 15 and 30.
15 and 30 are both composite numbers because each has more factors than 1 and the number itself.
40
Oh honey, the number 30 is as composite as a Kardashian selfie. It's made up of more factors than a soap opera plot. So yeah, it's definitely not a prime number.
The only prime number in that range is 29. All others are composite.