2. ● A prime number is a number greater than 1 with only two
factors – themselves and 1.
● A prime number cannot be divided by any other numbers
without leaving a remainder
● An example of a prime number is 13.
3. ● Prime factors are factors of a number that are, themselves,
prime numbers.
● There are many methods to find the prime
factors of a number, but one of the most
common is to use a prime factor tree.
For example 60
You do what two numbers times to give 60 and
2 and 30 - you will circle the 2 because it is a prime number then
you find 2 numbers timed. Together that give 30. 6 and 5 you will
circle 5 then you find 2 numbers that give 6 lke 3 and 2 then you
circle them both
4. ● 1 can only be divided by one number, 1 itself, so with this
definition 1 is not a prime number
● It is important to remember that mathematical definitions
develop and evolve
● Throughout history, many mathematicians considered 1 to be a
prime number although that is not now a commonly held view.
