Why isn't 57 a prime number?
回答 (18)
2008-08-28 4:47 pm
✔ 最佳答案
Factors of 57:1 , 3 , 19 , 57
(it has more than 2 factors, so it is a complex number.)
2008-08-28 1:31 pm
3 x 19 = 57
2008-08-28 1:36 pm
No 57 is not a prime number because it can be divided by 1, 3 and 57.
A prime number is a number that can be divided by 1 and the number itself. So that is why 57 is not a prime number. Just because 5 and 7 are prime numbers that doesn't make them a prime number together.
A prime number is a number that can be divided by 1 and the number itself. So that is why 57 is not a prime number. Just because 5 and 7 are prime numbers that doesn't make them a prime number together.
2008-08-28 1:30 pm
Because you can divide it by 1, 57 and...3
Add up the integers 5 + 7 = 12 and again 1 + 2 = 3 so it's divisible by three!
Divide by three and you get 19 which is another factor!
Hope that helps!
Add up the integers 5 + 7 = 12 and again 1 + 2 = 3 so it's divisible by three!
Divide by three and you get 19 which is another factor!
Hope that helps!
2008-08-28 1:34 pm
No,57/19=3, and 3X19=57.
2008-08-28 1:32 pm
because you can divide it by 19.
57 / 19 = 3
a prime number is only divisible by itself.
57 / 19 = 3
a prime number is only divisible by itself.
2008-08-28 2:28 pm
Prime numbers are only divisible by 1 and the number itself. 57 is divisible by 3 and 19 therefore it is not prime
2008-08-28 1:51 pm
Prime number definition is that a number can only divide itself and one like 2 can divide by 1 and 2,itself so it is a prime number. So, the number 57 has a factors of 1,3,19 and 57.then it is a prime number.
2008-08-28 1:42 pm
Add the digits :
5 + 7 = 12, which is divisible by 3.
That is a quick and dirty check that it is a multiple of 3, and as mentioned before, 19 x 3 = 57.
5 + 7 = 12, which is divisible by 3.
That is a quick and dirty check that it is a multiple of 3, and as mentioned before, 19 x 3 = 57.
2008-08-28 1:40 pm
57 is not a prime number because
3x19 = 57
a prime doesnt hav factors
3x19 = 57
a prime doesnt hav factors
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