What Is the Difference Between a Prime and Composite Number

Definition: A prime number is a whole number with exactly two integral divisors, 1 and itself. The number 1 is not a prime, since it has only one divisor. … Definition: A composite number is a whole number with more than two integral divisors. So all whole numbers (except 0 and 1 ) are either prime or composite.

What is prime and composite number with example?

A prime number has exactly two factors — 1 and the number itself. For example, the number 5 is prime because its only two factors are 1 and 5. A composite number has at least three factors. For example, the number 4 has three factors: 1, 2, and 4.

Is 23 a prime number or composite number?

Yes, 23 is a prime number. The number 23 is divisible only by 1 and the number itself. For a number to be classified as a prime number, it should have exactly two factors. Since 23 has exactly two factors, i.e. 1 and 23, it is a prime number.