If statement won't break in c

My first ever project as a newbie - seems almost there and I'm getting outputs that make sense. Problem is that the if statement in the for loop wont break if (n%i<1)... I've included the whole code in case I've messed up in the declarations...

//Program to take a number and see if it's prime
#include<stdio.h>
#include<conio.h>

int main() {
int n, i, f;
f = 0;
//input 
    printf("Enter a positive integer:");
    scanf_s("%d", &n);
    printf("%d is flag \n", f);

//logic
    for (i=2;i<=n/2;i++) {
    printf("%d \t %d \n\n",i ,n%i); //debug info printing
    if (n%i<1) {
        f = 1; 
        break; 
    }
}

// output   
    if (f = 1)
        printf("%d is not a prime number. \n", n);
    else
        printf("%d is a prime number. \n", n);
        printf("%d is flag\n", f);

_getch();
return 0;
}