Maths tuitions in Perumbakkam How to check if a number is prime or not. There is a simple prime number formula in maths to check if a number is prime or not, you can follow the steps outlined below: Start with the number you want to check. If the number is less than 2, it is not prime. Check for divisibility by numbers from 2 to the square root of the given number. If no divisors are found up to the square root of the number, it is prime. Here are prime number formula in maths in 3 simple steps Let's check if the number 17 is prime: Step - 1: Start with 17. It is greater than 1, so we proceed. Step - 2: Check for divisibility by numbers from 2 to the square root of 17. In this case, the square root of 17 is approximately 4.12, so we check for divisibility by 2, 3, and 4. Step - 3: No divisors are found up to the square root of 17, so we conclude that 17 is a prime number. best math classes best math classes for competitive exams best math classes for kids best math classes for kids near me best math classes in the world best math classes near me best math classes online best math classes online for kids best math courses for kids best math courses online best math online classes best math related courses best mathematics classes a list of prime numbers a list of prime numbers from 1 to 100 all prime numbers all prime numbers from 1 to 100 are prime numbers are prime numbers even are prime numbers odd below 100 prime numbers best formula for finding prime numbers best prime number