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

Is 1 a prime number?

Back

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

Front

What are the first five prime numbers?

Back

The first five prime numbers are 2, 3, 5, 7, and 11.

Front

What are the first five composite numbers?

Back

The first five composite numbers are 4, 6, 8, 9, and 10.

Front

How can you determine if a number is prime?

Back

To determine if a number is prime, check if it has only two factors: 1 and itself.

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

Is 21 prime or composite?

Back

Composite, because it has 4 factors: 1, 3, 7, and 21.

Front

Is 49 prime or composite?

Back

Composite, because it has 3 factors: 1, 7, and 49.