process.stdin.resume();
process.stdin.setEncoding('utf8');
 
const readline = require('readline');
 
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});
 
function esPrimo(numero) {
  if (numero <= 1) return false;
  if (numero === 2) return true;
  if (numero % 2 === 0) return false;
 
  const limite = Math.sqrt(numero);
  for (let i = 3; i <= limite; i += 2) {
    if (numero % i === 0) return false;
  }
  return true;
}
 
rl.question('Ingresa un número: ', (input) => {
  const numero = parseInt(input, 10);
  if (isNaN(numero)) {
    console.log("Entrada no válida. Debes ingresar un número entero.");
  } else {
    const resultado = esPrimo(numero)
      ? `El número ${numero} es primo.`
      : `El número ${numero} no es primo.`;
    console.log(resultado);
  }
  rl.close();
});
 

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