Prime and Composite

Front

What are prime numbers?

Back

Prime numbers are natural numbers greater than 1 that have exactly 2 factors: 1 and themselves.

Front

What are composite numbers?

Back

Composite numbers are natural numbers greater than 1 that have more than 2 factors.

Front

What is a factor?

Back

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

Front

Is 1 a prime number?

Back

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

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

List the first five prime numbers.

Back

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

Front

What is the difference between prime and composite numbers?

Back

Prime numbers have exactly 2 factors, while composite numbers have more than 2 factors.

Front

Which of the following is a prime number: 4, 5, 6, 7?

Back

5 and 7 are prime numbers.

Front

What is the prime factorization of 18?

Back

The prime factorization of 18 is 2 x 3 x 3 (or 2 x 3^2).

Front

Which number is NOT a factor of 30: 2, 3, 5, 8?

Back

8 is NOT a factor of 30.