Prime and composite

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

List the first five prime numbers.

Back

2, 3, 5, 7, 11

Front

Is 1 a prime number?

Back

No, 1 is not a prime number because it has only one positive divisor.

Front

What are the factors of 12?

Back

1, 2, 3, 4, 6, 12

Front

What are the factors of 9?

Back

1, 3, 9

Front

Which number is prime: 4 or 5?

Back

5 is prime; 4 is composite.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

Is 15 a prime or composite number?

Back

15 is a composite number because it has factors other than 1 and itself.

Front

Which of the following is a composite number: 2, 3, 4, 5?

Back

4 is a composite number.