We turn the arrays about 45 degrees clockwise to get 1 2 3 4 5 6 7 8 9 10 ... The first number of row $n+1$ is greater than $t_n$ (the $n$-th triangular number) by 1, i.e., $a_n=\frac{n(n-1)}2+1$. We call the numbers that are greater than triangular numbers by 1 "cool numbers". Note that $a_{63}=1954$ is the greatest cool numbers which is less than 2002. Hence 2002 is in the 63-th row. Since 2002-1954=48, then 2002 is in the 49-th column. Now we turn the array back. It is easy to see that 2002 is in the 15-th row and in the 49-th column.