To determine whether a number is a prime number or not, you need to check if the number is divisible only by 1 and itself. Is it a Prime Number?

1. If the number is less than 2, it’s not a prime number.
2. Iterate from 2 to the square root of the number. If the number is divisible by any integer in this range, it’s not a prime number.
3. If no divisors are found within the range, the number is a prime number.