Yes, 123456789 is a multiple of 9
123456789 + 123456789 = 246913578
Yes, 123456789 is a multiple of 3. To find out if it's a multiple of 3, you add the digits. In this case you would add 1+2+3+4+5+6+7+8+9=45. Now you take that 45 and divide by 3. If there is no remainder it is a multiple but if there is a remainder it is not a multiple. So in this case 45/3=15 with no remainder.
A number is divisible by 123456789 if it can be evenly divided by 123456789 without leaving a remainder. In other words, if the number divided by 123456789 results in an integer without any decimal places, then it is divisible by 123456789. The numbers that are divisible by 123456789 are multiples of 123456789, such as 123456789, 246913578, 370370367, and so on.
the answer is 15241578750190521
you get cheese
543234567890-123456789 = 543111111101
324536
1
789456 to 123456789 789456 to 123456789 789456 to 123456789 789456 to 123456789
123456789 +987654321 =1111111110
123456789-987654321 = -864197532