Flashcard on Prime 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

How many factors does a prime number have?

Back

A prime number has exactly 2 factors: 1 and the number itself.

Front

Which is the largest prime number under 20?

Back

The largest prime number under 20 is 19.

Front

Which statement about prime numbers is true?

Back

2 is the only even prime number.

Front

Which is the smallest two-digit prime number?

Back

The smallest two-digit prime number is 11.

Front

Which of these numbers is prime: 15, 23, 9, 12?

Back

23 is a prime number.

Front

Can a prime number be negative?

Back

No, prime numbers are positive integers greater than 1.

Front

Is 1 a prime number?

Back

No, 1 is not considered a prime number.

Front

What is the first prime number?

Back

The first prime number is 2.

Front

List the first five prime numbers.

Back

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