为什么 WA两个点 求助大佬

#include <bits/stdc++.h>
#define MAXSM 2333333
using namespace std;
int n , m , a[MAXSM] ;
int Is (int x ) {
    if (x == 2 )
        return 1 ; 
    for (int i = 2 ; i <= sqrt (x) ; i ++ )
        if ( x % i == 0 )
            return 0 ;
    return 1 ;
}
int main() {
    scanf ( "%d%d" , &n ,&m ) ;
    for (int i = 1 ; i <= m ; i ++ ) scanf ( "%d" , a + i ) ;
    for (int i = 1 ; i <= m ; i ++ ) 
        if (Is (a[i])) 
            printf( "Yes\n" ) ;
        else printf( "No\n" ) ;
    return 0 ;
}