Prime Numbers Flashcards
What is a prime number?
A prime number is a natural number greater than 1 that can only be decided by 1 and itself.
Is the number 1 a prime number?
No, the number 1 is not considered a prime number.
Which of the following numbers is prime: 4, 5, 6?
5 is a prime number.
What is the smallest prime number?
The smallest prime number is 2.
True or False: All even numbers are prime.
False.
List all prime numbers less than 10.
The prime numbers less than 10 are 2, 3, 5, and 7.
Fill in the blank: The first five prime numbers are 2, 3, 5, 7, and ____.
11.
What is the only even prime number?
The only even prime number is 2.
Which of the following is not a prime number: 11, 13, 15?
15 is not a prime number.
True or False: 23 is a prime number.
True.
What are the prime numbers between 10 and 20?
The prime numbers between 10 and 20 are 11, 13, 17, and 19.
Fill in the blank: A prime number can be devided exactly by only ____ numbers.
Two.
Is 19 a prime number?
Yes, 19 is a prime number.
Which of the following numbers is prime: 12, 17, 18?
17 is a prime number.
Fill in the blank: The prime numbers up to 23 are 2, 3, 5, 7, 11, 13, 17, 19, and _____.
23.
What is the sum of all prime numbers less than 10?
The sum is 17 (2 + 3 + 5 + 7).
Which number is prime: 21, 22, 23?
23 is a prime number.
True or False: 15 is a prime number.
False.
List all prime numbers up to 23.
2, 3, 5, 7, 11, 13, 17, 19, 23.
Fill in the blank: A prime number cannot be divided evenly by any number other than ____ and ____.
1 and itself.
Which of the following is a prime number: 6, 8, 13?
13 is a prime number.
True or False: 2 is the only prime number that is odd.
False.
