PRIME1 problem - Wrong Solution

This is my solution, I’ve been tweaking this as much as I could, I still doing know where I’m going wrong.

#include<bits/stdc++.h>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    cin>>t;
    long long int n,m;
    while(t--)
    {
        cin>>m>>n;
        if(m%2==0)
            ++m;
        for(;m<=n;m+=2)
        {
            if(m<9)
            {
                if(m==3 || m==5 || m==7 || m==1)
                {
                    if(m==1)
                        cout<<2<<"\n";
                    else
                        cout<<m<<"\n";
                }
                continue;
            }
            long int k=3;
            while(k<=sqrt(m) && m%k!=0)
                k+=2;
            if(k>sqrt(m))
                cout<<m<<"\n";
        }
        cout<<"\n";
    }
}

Drop link or code of the question ?

https://www.codechef.com/problems/PRIME1 This’s the link to the problem

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