It can be divided by 3 as in 12345/3=4115, but not 9 as in 12345/9=1371.6666666666666.
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yes 12345 is a prime number
No,because 45 is not divisible by both 2 and 3. In order for a number to be divisible by 6 it has to be divisible by both 2 and 3.
a number is divisible by 12 if the number is also divisible by both 3 and 7. You mean a number is divisible by 21 if it is divisible by 3 and 7.
The number 90 is divisible by both 2 and 3.
15 is the smallest number divisible by both 3 and 5