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.
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324536
123456789+987654321+123456789+987654321=100
1.524157875019052e+16
1234567 + 123456789 = 124691356