Generate N primes numbers with Rust

Primes.rs

use std::time::{SystemTime, UNIX_EPOCH};

fn is_prime(num: u128) -> bool
{
    let mut response: bool = true;
    for i in (2..(num-1) as usize).step_by(1){
        if (num % i as u128) == 0 {
            response = false;
        }
    };

    return response;
}

fn main() {
    let time_start = (SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .expect("Time went backwards")).as_millis();

    const SIZEARRAY: usize = 3000;
    let mut array: [u128; SIZEARRAY] = [0; SIZEARRAY];
    let num_inicial = 3;
    let num_final : u128 = 1e10 as u128;

    let mut inc: u128= 0;

    println!("-------------------------------------------");
    println!("Se solicitaron {} números primos, desde el {} hasta el {}", SIZEARRAY, num_inicial, num_final);
    for i in num_inicial..num_final{
        if is_prime(i) && inc < SIZEARRAY as u128 {
            array[inc as usize] = i;
            inc+=1;
            continue;
        }

        if inc > (SIZEARRAY - 1) as u128
        {
            break;
        }
    }

    for i in array.iter(){
        print!(" - {}", i);
    }
    println!(" - ");

    let time_end = (SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .expect("Time went backwards")).as_millis();

    println!("-------------------------------------------");
    println!("Duracion en milisegundos -> {:?}", time_end-time_start);

}