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13 and 19 are prime.

33 and 45 are composite.

Q: Identify each number as a prime or composite number 13 33 45 19?

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If you can arrange the counters in the shape of a rectangle with at least two in each row and each column then the number is composite. The numbers of row and the numbers of columns are factors of the given number. If the only rectangle you can make is the "degenerate" one, with only one row or only one column, then the number is prime.

43 is prime. 32 is composite.

4 is composite, 31 is prime.

There are four of each.

Because 100 only has one prime factorization.Because each composite whole number has a unique prime factorization.

Related questions

Identify each number as prime, composite or neither: 1

51 is composite, 103 is prime.

There are infinitely many numbers, and these comprise infinitely many primes and composites. It is not possible to list them all.

Each composite number has its own unique prime factorization.

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.

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

If you can arrange the counters in the shape of a rectangle with at least two in each row and each column then the number is composite. The numbers of row and the numbers of columns are factors of the given number. If the only rectangle you can make is the "degenerate" one, with only one row or only one column, then the number is prime.

no

identify two composite numbers that each have 8 as a factor

43 is prime. 32 is composite.

11, prime. 22, composite.

37 is prime, 42 is composite.