Alright, let's solve this math problem step by step. First, we have the number 594. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 15. So, we're going to take the number 594 and add it to itself 15 times.
Step 1: 0 + 594 = 594
Step 2: 594 + 594 = 1188
Step 3: 1188 + 594 = 1782
Step 4: 1782 + 594 = 2376
Step 5: 2376 + 594 = 2970
Step 6: 2970 + 594 = 3564
Step 7: 3564 + 594 = 4158
Step 8: 4158 + 594 = 4752
Step 9: 4752 + 594 = 5346
Step 10: 5346 + 594 = 5940
Step 11: 5940 + 594 = 6534
Step 12: 6534 + 594 = 7128
Step 13: 7128 + 594 = 7722
Step 14: 7722 + 594 = 8316
Step 15: 8316 + 594 = 8910

So, 594*15 = 8910