Primes and Composites

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has exactly two factors: 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 factors.

Front

Is the number 1 a prime number?

Back

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

Front

What is the only even prime number?

Back

The only even prime number is 2.

Front

Can prime numbers be even?

Back

Yes, the only even prime number is 2; all other even numbers are composite.

Front

List the first five prime numbers.

Back

2, 3, 5, 7, 11.

Front

What is the smallest composite number?

Back

The smallest composite number is 4.

Front

Are all prime numbers odd?

Back

No, the only even prime number is 2; all other prime numbers are odd.

Front

What is a factor?

Back

A factor is a number that divides another number without leaving a remainder.

Front

How many factors does a prime number have?

Back

A prime number has exactly two factors.