![]() You might also like this article on decimal numbers in Python. What is prime number Prime number is a positive natural number that has only two positive natural number divisors - one and the number itself. To learn more about numbers, you can read this article on complex numbers in python. In this article, we have discussed three ways to check for a prime number in python. Prime numbers are a subset of natural numbers. It is a number that cannot be factored in. Numbers like 2, 3, 5, 7, 11, 13 and 17, are all considered prime numbers because they have exactly two factors, 1 and the number itself. A prime number cannot be divided by any other numbers without leaving a remainder. ![]() If a factor is present, it returns False stating that the input number N is not a prime number. Prime Number is a positive integer that is not divisible without remainder by any integer except itself and 1. Then it checks whether any number between 2 and N-1 is a factor of N or not using a for loop. For this, we will define a function isPrime() that takes a number N as input. What are Prime Numbers A prime number is defined as a natural number greater than 1 and is divisible by only 1 and itself. ![]() Check For Prime Number in Pythonįor checking if a number is prime or not, we just have to make sure that all the numbers greater than 1 and less than the number itself should not be a factor of the number. You can observe that all other numbers also have only two factors.
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