Bash script error: [i: command not found

Question

This program is suppose to accept a number from the user and print that many prime numbers. For some reason the program doesn\'t work. I am new to bash scripting and this is my

Answer 1

#!/bin/bash
#
# primes
#
read -p "Enter a  number: " n
i=2

for (( i=2; i <= n; i++ ))
do
    for (( j=2; j*j < i; j++ ))
    do
        if ((i % j == 0))
        then
            echo "no prime, $i divider: "$j
            break
        fi
    done
done

updated, after realizing (thanks Will Ness), that all primes up to INPUT are searched.

i needs to run to √(n) only.