The opposite of prime numbers are composite numbers.
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Composite numbers are distinct from prime numbers, but not completely opposite.
The 'opposite' status of a number that is not prime is a composite number.Except for 0 and 1, all numbers that are not prime (i.e. they are multiples of other numbers) are called composite numbers.The opposite of a prime number would be a number that is not prime. Almost all numbers that are not prime are composite numbers. A prime number is a number that has exactly two factors. A composite number has more than two factors. However, composite numbers do not include all numbers that are not prime. The number 1 has only one factor, so it is neither prime nor composite - it is unity.
Prime numbers are numbers that have only 2 factors, 1 and it's self. Composite numbers are the opposite, they have 3 or more factors.
Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.
The opposite of a common factor is a prime factor. Common factors are numbers that evenly divide two or more integers, while prime factors are numbers that are only divisible by 1 and themselves. The prime factors of a number are the building blocks that make up that number, and they cannot be further broken down into smaller factors.