There is no easy way. You will have to try dividing it by the smallest prime (2), then the next one (3) and continue until you have tried out the all the primes up to and including the square root of the number. You do not need to find the quotient, you only need check for divisibility.
A number is prime if it only has two factors.
It is a prime.
If the number is < 2 then it is not a prime. If the number is == 2 then it is a prime. If the number is divisible by 2 then it is not a prime and so on.
A prime number only has two factors. If the number you're looking at has more than two factors, it is not prime.
If a no number goes into is evenly expect one.
Yes
Only one and eleven go into 11 so it is prime.
A prime number is a positive integer with two factors: one and the number itself. If you test the numbers up to the square root and your number is not divisible by any of them, it's prime.
A prime number is a positive integer with two factors: one and the number itself. If you test the numbers up to the square root and your number is not divisible by any of them, it's prime.
if it has no other number that can divide into itself but itself ================================== Another contributor clarified: You have to determine whether there is any number ... besides '1' and the number under test itself ... that can divide evenly into the number under test. If you find even one, then it's not a prime. If there are none, then it's a prime.
the prime factorization of 56 is a prime number that are only divisible by twounique factors.
If a number is divisible by 3 or more numbers than that number is composite, if not than it is prime.
If the number can be multiplied by any number other than 1 it is a composite any other is prime