C'de matristeki asallar nasıl bulunur?

#include <stdio.h>
#include <math.h>

int isPrime(int value) {
    if ((value & 0x1) == 0) return 0;
    const int LIMIT = (int)sqrt(value);
    for (int i = 3; i <= LIMIT; ++i) if (value % i == 0) return 0;
    return 1;
}

void printPrimeMatrix(int row, int col) {
    for (int i = 0; i < row; ++i) {
        for (int j = 0; j < col; ++j) {
            const int current = i * col + j;
            printf("%4d", isPrime(current) == 1 ? 0 : current);
        }
        printf("\n");
    }
}

int main() {
    printPrimeMatrix(10, 5);
    return 0;
}

   0   0   2   0   4
   0   6   0   8   9
  10   0  12   0  14
  15  16   0  18   0
  20  21  22   0  24
  25  26  27  28   0
  30   0  32  33  34
  35  36   0  38  39
  40   0  42   0  44
  45  46   0  48  49