Yhdistämisluku

Yhdistämisluku is a Finnish term that translates to "composite number" in English. A composite number is a positive integer that has at least one divisor other than one and itself. In simpler terms, it is a number that can be formed by multiplying two smaller positive integers. For example, the number 6 is a composite number because it can be expressed as the product of 2 and 3 (2 * 3 = 6). Other examples of composite numbers include 4 (2 * 2), 8 (2 * 4), 9 (3 * 3), and 10 (2 * 5).

The set of composite numbers is the complement of the set of prime numbers and the number 1 within the set of positive integers. Prime numbers, by definition, are positive integers greater than 1 that have exactly two distinct positive divisors: 1 and themselves. The number 1 is neither prime nor composite. Therefore, any integer greater than 1 is either prime or composite. Understanding composite numbers is fundamental in number theory, particularly in areas like factorization and the study of divisibility.