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Yes, a factor is a number that can be divided exactly into another number with no remainder.
13 is a prime number so the only factors are 1 and itself.
To find the GCF of 13 and 39, you can list the factors of each number. The factors of 13 are 1, 13. The factors of 39 are 1, 3, 13, 39. 13 is the GCF of 13 and 39. 3 is a prime number has only two factors: 1 and 13. 13 will divide into 39 three times. Since 13 is a prime number that will divide into 39, it has to be the GCF of 13 and 39.
The factors of 325 are 1, 5, 13, 25, 65, and 325. 5 and 13 are prime.
Multiples of 13 have 13 as a factor. 13, 26, 39 and so on.