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To identify whether a number is prime or composite, look at its factors. A Prime number has exactly two factors: one and itself. A composite number has more factors and can be written as the product of prime numbers.

For example:

Factors of 17: 1 and 17 so 17 is prime.

Factors of 102: 1, 2, 3, 6, 17, 34, 51 and 102 so 102 is composite. It can be expressed as the product of prime numbers by prime factoring: 2 x 3 x 17

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Q: How do you identify a number if its prime or composite number?

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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.

A prime number has only two factors which are itself and one whereas a composite number has more than two factors

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.

It is not a prime number, it is a composite number.

It is a prime number, and therefore not a composite number.211 is a prime number.

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Identify each number as prime, composite or neither: 1

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

119 is a prime 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.

factor tree

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.

A prime number has only two factors which are itself and one whereas a composite number has more than two factors

Factor it. Prime numbers have two factors, composite numbers have more than two.

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It is not a prime number, it is a composite number.

It is prime

86 is not a prime number, so is a composite.

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