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Q: Why isn't 247 a prime number?

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247 is not prime. 247 = 13 * 19

No, 247 is NOT a prime number. The simple definition of a prime number in simple math is: Any number that can only be divided by itself and the number "1", the number is then PRIME, not composite. 247 is a composite number; its factors are: 1, 13, 19, 247.

Composite

Composite

247/13=19 247 is not a prime

247 is a composite number because it has more than two factors

because this number is not divisible by 2

One.

39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.

The two prime numbers 13*19=247

A prime number is a whole number that can only be divided equally by itself and 1. 2717 divided by 11 is 247; therefore 2717 is not a prime number.

The 4 factors of 247 are 1, 13, 19, and 247. The factor pairs of 247 are 1 x 247 and 13 x 19. The prime factors of 247 are 13 and 19. The prime factorization of 247 is 13 x 19.

9 times 11 is 99. A prime is a number whose factors are one and itself.

83

1. The numbers are co-prime.

Prime numbers are numbers that can be divided by by only 1 and itself. 494 can be divided by 2, 247 etc. so it is not a prime number.

no, 5 isnt divisable by 19. 19 is a prime number and isnt divisable by anything.

All of the prime numbers (except 2) are odd. The sum of any two prime numbers (except 2) will be even. Unless 245 is a prime number (it isn't) your question does not have a solution.

13 x 19 = 247

13 x 19 = 247

a prime number is a number that can only be divided by 1and its self... 1 isnt a prime number but 2, 3, 5, 7, 9, 11 etc... are prime numbers.

23, 37, 79 and 51 (assuming 1851 is a typo, 18 isnt a prime) if not a typo 1851 isnt a prime number anyway, it divides by 3

Any number multiplied by 247.

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 247 is composite.

13 and 19