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prime numbers are numbers that can only be divided by themselves and 1 (excluding the nuber 1 itself as it can only be divided by its self)

therefore 7 and 13 are prime because

5*3=1

9*3=27

13*3=39

and 3*17=51

Q: What number is a prime number 7 13 15 27 39 51?

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27 is not a prime number.

A prime number is a number that is divisible only by 1 and itself; it has no other factors. The factors of 7 are 1 and 7. The factors of 13 are 1 and 13. The factors of 27 are 1, 3, 9, and 27. The factors of 29 are 1 and 29. Therefore, 27 is the only one that is not a prime number.

47 is.

They are all prime numbers except for 15 21 25 and 27 which are composite numbers

27 is not prime number because it has more than two factors. Factors of 27 are 1, 3, 9 and 27.

Related questions

13

27 is not a prime number.

The numbers 13 and 29 are prime - the one composite number in that list is 27.

27

27

They are 13 and 19 which are prime numbers

41 is the prime number in this list.

13 has no factors other than itself and unity.

11 is prime.

A prime number is a number that is divisible only by 1 and itself; it has no other factors. The factors of 7 are 1 and 7. The factors of 13 are 1 and 13. The factors of 27 are 1, 3, 9, and 27. The factors of 29 are 1 and 29. Therefore, 27 is the only one that is not a prime number.

27 and 55 are composite numbers but 13 is a prime number

47 is.