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No, not all numbers except 1 are composite numbers. The integers greater than 1 are either prime numbers or composite numbers. A Prime number is a number with exactly two factors - 1 and itself. A composite number is a number with more than two factors.

Examples:
1 is unity.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, and 31 are prime numbers.
4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, and 30 are composite numbers.

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Q: Are all numbers except 1 composite numbers?
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