The last 2 digits are divisible by 4
1312 is (12÷4=3) (1312 ÷ 4=328).
7019 is not- so four does not go in (evenly).
That one is great, but I have found one that works too. Divide the number by two, if it is still even- it is a multiple of four. ( Divide in half one more time to get your answer).
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2.50
The least 4 factors of 144 are 1, 2, 3, and 4 .
There is no divisibility rule for 13 because it is a prime number. If you are thinking: why is there a divsibility rule for 2 and 3 then. Well, i don't know so go look it up on google.
samyoora fiklan
It is 3 6 9