Prime and Composite Numbers

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Front

What is a composite number?

Back

A composite number is a natural number greater than 1 that has more than two positive divisors.

Front

Is the number 1 considered prime or composite?

Back

Neither, because it has only one positive divisor.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

What is the only even prime number?

Back

The only even prime number is 2.

Front

List three examples of composite numbers.

Back

4, 6, 8.

Front

What is the prime factorization of 21?

Back

The prime factorization of 21 is 3 x 7.

Front

How can you determine if a number is prime?

Back

A number is prime if it cannot be divided evenly by any other numbers except for 1 and itself.

Front

What is the prime factorization of 81?

Back

The prime factorization of 81 is 3 x 3 x 3 x 3 (or 3^4).

Front

Are all even numbers composite?

Back

No, the only even prime number is 2.