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Prime and composite numbers
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What
is
a
prime
number
?
A
prime
number
is a positive whole number with only two
factors
:
1 and
itself.
For
example, 7 is a prime number. The only factors of 7 are 1 and
7.
1
×
7
=
7
What
is
a
composite
number
?
A
composite
number
has more factors than just 1 and
itself.
For
example, 15 is a composite number. It has the factors 1, 3, 5, and
15.
3
×
5
=
15
1
×
15
=
15
Prime
and
composite
numbers
chart
This
chart shows all of the prime numbers within
200.
Fun
facts
The
numbers
0
and
1
are
neither
prime
nor
composite
.
All
even
numbers
except
for
2
are
composite
numbers
.
Every
whole
number
greater
than
1
is
either
prime
or
composite
.
Try some practice problems!
Practice now
Prime and composite: up to 20
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