Let's roll up our sleeves and solve this. We have 629 and we're going to multiply it by 4, essentially adding 629 to itself 4 times.
Step 1: 0 + 629 = 629
Step 2: 629 + 629 = 1258
Step 3: 1258 + 629 = 1887
Step 4: 1887 + 629 = 2516

So, 629*4 = 2516