Prime and Composite Numbers

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

What are the only factors of a prime number?

Back

1 and itself.

Front

Is the number 1 a prime number?

Back

No, 1 is not a prime number.

Front

Is the number 2 a prime number?

Back

Yes, 2 is the only even prime number.

Front

What is the smallest composite number?

Back

The smallest composite number is 4.

Front

Is 15 a prime or composite number?

Back

Composite.

Front

What is the sum of the first three prime numbers?

Back

2 + 3 + 5 = 10.

Front

Which of the following numbers is prime: 21, 29, 33?

Back

29 is prime.