Calculadora de Números Primos

The Prime Number Calculator is an online tool that checks if a positive integer is prime or composite. If composite, it also returns the smallest prime divisor. The operation is simple: you enter a number, and the calculator tests divisibility by prime numbers up to the square root of the number, using the Sieve of Eratosthenes. If a divisor is found, the number is composite and the divisor is displayed; otherwise, it is prime.

This calculator is useful in various scenarios, such as solving basic math problems, number theory exercises, or checking primality for simple cryptography. Elementary and high school students can use it to verify their answers, while math enthusiasts can quickly test large numbers. It is also helpful for teachers demonstrating the concept of primality in the classroom.

When using the calculator, remember that it only handles positive integers. Negative numbers, decimals, or zero are not processed correctly. Additionally, very large numbers may require more processing time, though the tool is optimized for most cases. For numbers above 10 million, verification may take a few seconds. Ensure the entered number is within practical limits.