Why is 19 a prime number but 15 is not a prime number?

Anonymous

∙ 15y ago

Updated: 8/18/2019

19 only has 2 factors - itself and 1.

15 has 4 factors - itself, 1, 3, and 5.

Prime numbers can only have 2 factors.

19 is prime, 15 is composite.

Wiki User

∙ 15y ago

What else can I help you with?

Which is not a prime number 13 15 17 19?

3 x 5 = 15, so 15 is not a prime number.

Which is a composite Number 15 17 19 or 23?

15 is composite number 17, 19 and 23 are prime numbers.

What prime number is between 15 and 20?

17... and 19 !

What is the prime number for 19?

19 is a prime.

Is 19 a prim number or a composite number?

19 is a prime number.19 is a prime number.19 is a prime number.19 is a prime number.

What is the prime factor of 19?

19 is a prime number, so it has no prime factorization.

What is the greatest common factor of 19 and 15?

Do a factor tree. 15 ^ 5 3 (3 & 5 are prime) 19 is a prime number. 15: 3 * 5 19: 19 ^^They have nothing in common. Therefore, the answer is 1.

What number is prime and between 15 and 25 and has 57 as a multiple?

It is 19

What is a prime number 105 or 27 or 19 or 9?

19 is the prime number.

Is 19 composite number or prime number?

19 is prime.

Is the number 19 a prime?

19 is a prime number.

Is 19 a prime number or a compsite?

19 is a prime number

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