Prime Numbers

Prime Numbers

A Primes number is a whole number that can only be divided evenly by itself or 1.  Thus, there is only 1 pair of factors ... the number 1 and the number itself.  

Examples:

1 x 2Prime

1 x 3Prime

1 x 4, 2 x 2Not Prime

1 x 5Prime

1 x 6, 2 x 3Not Prime

1 x 7Prime

1 x 8, 2 x 4Not Prime

1 x 9, 3 x 3Not Prime

To see more prime numbers, go to the  "Sieve of Eratosthenes"  to see the prime numbers between 2 and 100.

Check Your Understanding

  1. Think of a prime number between 2 and 100. (ex: 7)
  2. Enter the number below. (ex: 7)
  3. Click the button "Check" and check your answer.