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 the number 2 prime or composite?

Back

Prime, because it has exactly two factors: 1 and 2.

Front

Is the number 3 prime or composite?

Back

Prime, because it has exactly two factors: 1 and 3.

Front

Is the number 4 prime or composite?

Back

Composite, because it has three factors: 1, 2, and 4.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

Is the number 1 prime or composite?

Back

Neither, because it has only one positive divisor: itself.

Front

List the first five prime numbers.

Back

2, 3, 5, 7, 11.

Front

What is the difference between prime and composite numbers?

Back

Prime numbers have exactly two distinct positive divisors, while composite numbers have more than two.

Front

Is 15 prime or composite?

Back

Composite, because it has four factors: 1, 3, 5, and 15.