Prime Numbers

I think you misworded your question. I am not exactly sure what you are looking for. If you want to know the prime factorization of the number 28, it is, 2^2 * 7. That is two squared times seven.

On Jan. 25, 2013, the largest known prime number, 257,885,161-1, was discovered on Great Internet Mersenne Prime Search (GIMPS) volunteer Curtis Cooper's computer. The new prime number, 2 multiplied by itself 57,885,161 times, less one, has 17,425,170 digits.

No, the prime factorization of 342 is 2*3*3*19.

2 x 5 = 10

These: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

They are: 2 3 5 7 11 13 17 19 23 29.

4.

7281 is composite. 7281 = 3 * 3 * 809 = 32 * 809

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No.

Yes, but there is only one of them. A prime number is any number that only has only one and itself as factors. By definition even numbers have a factor of two. Therefore the only even number that is prime is the number 2.

3 and 7

24 is not prime.

24 = 2*2*2*3. 2 and 3 are primes.

A prime number is any number that only has one and itself as factors. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number.

245 / 5
49 / 7
7

The answer is 51 * 72

No, they are both composite.

53 59 61 67.

(3 x 6) + 2 x 4 = 32 :) my 11 year old brain =]

144

72,2

36,2,2

18,2,2,2

9,2,2,2,2

3,3,2,2,2,2

factors: 1, 61, 83, 5063

prime factors: 61, 83

The factors of 13824 are: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27, 32, 36, 48, 54, 64, 72, 96, 108, 128, 144, 192, 216, 256, 288, 384, 432, 512, 576, 768, 864, 1152, 1536, 1728, 2304, 3456, 4608, 6912, and 13824.
The prime factors of 13824 are: 2 and 3.

5 x 5 x 2 x 31

A prime number is a positive integer with two factors: one and the number itself.

composite number

2 and 1021