Finding Prime Numbers
Maths: KS3, topic 1.8.4
Finding prime numbers
Learn how to identify prime numbers by checking their factors.
Prime numbers
A prime number has exactly 2 factors
One factor is 1
The other factor is the number itself
For example, 7 is prime because its only factors are 1 and 7
Not prime
A number is not prime if it has more than 2 factors
- For example, 6 has factors 1, 2, 3 and 6
So, 6 is not prime
The number 1
The number 1 is not prime
It only has 1 factor
A prime number must have exactly 2 factors