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

List the first five composite numbers.

Back

4, 6, 8, 9, 10.

Front

Is 1 a prime number?

Back

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

Front

Is 2 a prime number?

Back

Yes, 2 is a prime number because it has exactly two positive divisors: 1 and 2.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

What is the smallest composite number?

Back

The smallest composite number is 4.

Front

How many factors does the number 5 have?

Back

The number 5 has two factors: 1 and 5.

Front

How many factors does the number 21 have?

Back

The number 21 has four factors: 1, 3, 7, and 21.