One easy way to check is sum of digits.
819: 8+1+9 = 18. 18 is a multiple of 3. 819 is divisible by 3.
440: 4+4+0 = 8. Not a multiple of 3. 440 is not divisible by 3.
222: 2+2+2 = 6. 6 is a multiple of 3. 222 is divisible by 3.
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