0
composite
3 goes into 3 or 30
3 goes into 9
so 3 goes into 39
13 + 13 + 13 = 39 = 3 x 13
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Applying a divisibility test:
To be divisible by 3, sum the digits of the number and if this sum is divisible by 3, then the original number is divisible by 3.
As the test can be repeated on the sum, repeat the summing until a single digit remains; only if this number is one of {3, 6, 9} is the original number divisible by 3.
For 39 this gives:
39 → 3 + 9 = 12
12 → 1 + 2 = 3
3 is one of {3, 6,9} so 39 is divisible by 3.
As 39 is divisible by 3 (that is 3 is a factor of 39 that is less than 39) and 3 is greater than 1 then 39 is a composite number.
Wiki User
∙ 6y ago
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Is 39 and 9 prime or composite?
39 is prime, 9 is composite.
Is 39 prime of composite?
39 is composite.
Is 39 a prime a composite?
39 is a Composite Number.
Is 39 an composite or prime?
It is composite.
Is 39 prime neither composite?
39 is a Composite Number.
39 prime number or composite number?
39 is composite
Is the number 39 prime?
39 is not a prime; it is a composite number.
Which one is composite 43 or 39?
43 is prime; 39 is composite.
Is the number 39 prime or composite?
Composite.
Is 39 and 88 a prime composite?
Both composite.
Is 29 and 39 prime numbers?
29 is prime but 39 is composite
What is 39 prime or composite?
39 is prime because no number can go into it.
