Q: Is a positive number divisible by 13?

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The divisibility rule for 3 is as follows: If the sum of the digits of a number is divisible by 3 then the number is divisible by 3. For example, the number 21 is divisible by 3 since 2+1=3, and 3 is divisible by 3. The number 49 is not divisible by 3 since 4+9=13, and 13 is not divisible by 3.

30, which is the smallest positive integer divisible by the first three primes: 2, 3 and 5.

The number must be divisible by 13 and by 11.

The smallest number is 420.

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some are but most are not. There are actually an infinite number that are, 13, 26, 39, 52, etc. are all divisible by 13.

A number is divisible by 13 if it is a multiple of 13. In other words, 13 times a number results in a big number that is divisible by 13.

13 and all its multiples are divisible by 13.

The number 70 is divisible by 13, but not evenly.

Every number divisible by 10 is divisible by 5.

The number 143 is divisible by 1, 11, 13, and 143.

No 13 is not divisible by 3 because there would be a remainder of 1 and a number that is divisible by another should have no remainder

All positive integers are divisible by at least one number.

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No. A positive integer cannot be divisible by a number bigger than itself!

221 is divisible by 1, 13, 17, and 221.

Every number except zero is divisible by 1 but the result won't always necessarily be a whole number or a positive number.