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

Which number is NOT prime: 2, 3, 4, 5?

Back

4 is NOT a prime number.

Front

List the first five prime numbers.

Back

2, 3, 5, 7, 11.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

What is a factor?

Back

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

Front

What are the factors of 15?

Back

The factors of 15 are 1, 3, 5, and 15.

Front

Is 1 a prime number? Why or why not?

Back

No, 1 is not a prime number because it does not meet the definition of having exactly two distinct positive divisors.

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

How can you determine if a number is prime?

Back

To determine if a number is prime, check if it has any divisors other than 1 and itself by testing divisibility with prime numbers up to its square root.