Oh
[Music]
in this video we're going to look at the
difference between prime numbers and
composite numbers a prime number is any
number that can only be divided by
itself and 1 a whole number of times so
basically it's only factors are 1 and
itself
although there is an exception to this
which is that one doesn't count as a
prime number
the number two is a prime number though
because it's only factors are 1 & 2 3 is
also a prime number because it can only
be divided by 1 & 3 the number 4 though
isn't prime because it can be divided by
2 as well as 1 & 4
five is prime and six isn't primer as is
divisible by three or two as well as one
and six other prime numbers include 7 11
13 17 19 23 and 29 with the list
continuing on God
one thing you might have noticed is that
2 is the only even prime number this is
because all other even numbers are
divisible by 2 which means that they
can't be Prime
now there's not really any easy way to
find out if a number is prime or not you
basically just have to keep trying to
divided by things and see if any of them
work for example if we took the number
17 we could think to ourselves is this a
multiple of two no is it a multiple of
three no and so on working our way
through the numbers and so we're happy
that is not divisible by any whole
numbers except 1 and 17
you
now a composite number is basically any
number that isn't prime but again one is
the exception and isn't a composite
number either so six would be a
composite number because it's not a
prime number or in other words is
divisible by numbers other than one and
six in this case two and three so
numbers are like four eight nine and ten
would also be composite numbers because
none of these are prime
anyway that's everything for this video
so I hope that makes sense and we'll see
you next time
you