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Answered 2010-06-29 12:31:46

No, it is not a Prime number.

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The prime factors of 28 are: 2,7


No, 28 is a Composite Number.


There is no prime number equal to 28. I know you must find this disappointing.


No, 1 is not a prime number.


28 is a composite number because it has more than two factors but 29 is a prime number because it has only two factors.


The prime factorization of 28 is: 2 x 2 x 7


23 is the only prime number between 20 and 28.


Prime factors of 256=2x2x2x2x2x2x2x2 (or 28)


It can be. 27 is relatively prime to 28.


61 is prime 28 = 4 x 7 = 2 x 14 83 is prime 29 is prime



Because 7 is a factor of 28 and 63 and 7 is a prime number.


Prime factorizations are unique. No other number will have exactly the same number of prime factors as 28. Multiples of 14 will have some of the same factors.


No, it's even. The only even prime number is 2.


2842 is a single number which is a composite, not a prime.


No it is divisible by 2 and 28


No, in order for a number to be prime it has to only be able to be divided by itself and 1, 28 can be made by multiplying 7 and 4 as well as 14 and 2.


28 is composite. Its factors are 1, 2, 4, 7, 14 and 28. Since it has factors other than 1 and itself, it is not prime - it is composite.Its prime factors are 2×2×7.28 is an even number greater than 2. It is a composite number.28 is composite.


To find the prime factors of a number, it is easiest to divide that number by any obvious factors. In this case, 28 is even so we can divide by 2 to give 14. 14 is also even, so we can divide by 2 again to give 7. 7 is prime, so we have finished prime factorising 28. Thus, the prime factors of 28 are 2, 2 and 7.


No. It is even, so divisible by 2.


28 is composite. All even numbers greater than two are composite. 28 = 4 x 7 so it's not a prime number


28 = 2 × 2 × 7 = 2² × 7.


Prime factorization of 28 is: 2 x 2 x 7


28 is a composite number as it is divisible by numbers other than itself and one. 28 is divisible by 1, 2, 4, 7, 14 and 28


The numbers are 13 and 41. And you do not need to know that they are prime in order to find the answer. The sum (54) and difference (28) provide all the necessary information.



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