prime numbers

• Prime numbers


  Whole numbers with only two factors: one and the number itself
• Prime numbers

  • 3
  • 7
  • 13
  • 2
• All even numbers except 2 are composite (not prime)
• Factors

  • Numbers that can be multiplied together to get another number
• Determining if a number is prime

  1. List the factors of the number

  2. If the number has only two factors (1 and itself), it is prime

  3. If the number has more than two factors, it is composite (not prime)
• Determining if a number is prime or composite

  • 2 (prime)
  • 21 (composite)
  • 13 (prime)
  • 8 (composite)
  • 5462 (composite)
• Even numbers except 2 are automatically composite (not prime)