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531 is a composite number. A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

Q: Is each number prime composite or neither 531?

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no

37 is prime, 42 is composite.

No. If the number has one factor (other than 1 and itself) it is a composite. However, to establish that a number is prime it needs to be checked for divisibility by each prime number up to the square root of the number. If the only factor found is 1, then it is a prime.

15 and 30 are both composite numbers because each has more factors than 1 and the number itself.

Neither 15 nor 24 are prime numbers. Each has more factors than 1 and the number itself.

Related questions

Identify each number as prime, composite or neither: 1

51 is composite, 103 is prime.

Not all numbers are either prime or composite. The number 1/2 is neither prime nor composite. If you are referring only to the natural or counting numbers, note that every natural number is equal to the product of itself and 1 so each number has at least one divisor, itself. If it has no more divisors, then it is prime. If it has more than itself as a divisor, then it is composite.

Each composite number has its own unique prime factorization.

13 and 19 are prime. 33 and 45 are composite.

No. Each composite number has its own unique prime factorization.

In theory it is possible but in practice, if a number is a product of two very large primes - each being a hundred digits long, or larger - then it is very difficult to tell whether it is prime or composite. The fact that it is so difficult makes this characteristic particularly useful for data encryption.

no

Neither nine nor sixteen are prime numbers. They are relatively prime to each other.

Neither 494733 nor 27 is a prime number because they each are divisible by 3.

43 is prime. 32 is composite.

11, prime. 22, composite.