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Q: Why cant a whole number ending in 8 be prime?

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169 is not a prime number because it cant be evenly divided.

293 is a prime number, therefore the prime factorization of it would be 293, you cant do 293x1 because 1 is NOT a prime number therefore you cant do it because it wouldn't b a prime factorization that is your answer

If 135 was a prime number its only factors would be 1 and 135, but by ending in a 5 that means 5 is a factor which means it cant be a prime number, so its factors are atleast (may be more) 1,5,27,135 which makes it composite.

2 is an even but prime number because it cant be divided by its self or by any other number.

But 5 is a prime number because it has only two factors which are itself and one

2 and 3 are prime numbers.

13 is a prime number because u cant find 13 as a product on a multiplication!

If you have a whole number it cant be a mixed number that's just silly.

you cant

odd is a number you cant halve a prime number is a number that you can double itself and it is odd

You can, in the right circumstances.

a factor is actually like a tree with branches.just divide 90 by prime whole numbers until you get all prime numbers.first divide 90 by 290/2 = 45 [2 is a prime whole number]45/5 = 9 [5 is a prime whole number]9/3 = 3 [3 is a prime whole number]since your last number is 3 you cant divide anymore to get a smaller prime whole number.so now use the numbers you have... 90,45,9,2,3,3, and 5 to make your factor tree.start with 90 at top. make two branches with 45 and 2 on the ends. make two more branches from 45 with 9 and 2 on the ends. make two more branches from the 9 with a 3 and 3 on the ends. all of the ends of your branches now have prime whole numbers and you are finish!9045,215,3,25,3,3,2

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

no because if it is a even number it cannot be a prime number whether its biger or smaller that two so no it cant

2 is even. 2 is prime. Any other even number has 2 as a factor, so it has too many factors to be prime.

Its a prime number and cant be factored except by itself or one

ummm...you really cant do tht

70 is the smallest number that has prime factors of 2,5 and 7

prime numbershi prime numbers are not in the time tabal some children get stauk on them, LIKE a nume 4 is an sqere number it cant be a prime number thads what pepol get stuk on.all the numbers in the time tabal WIIL NOT BE A PRIME NUMBER.

No it is not because it ends in 2 4 6 or 8 so it cant be prime it can be divided by 2

739 is a prime number.

well yes, but you wil get a decimal number, not a whole number because you cant divide a odd number by an even number and get a whole number, 15.5 is the correct answer

because you cant do anything times anything and get sixty one

because you cant have a partial electron

Other than 2, no prime numbers are even. So prime numbers can't end in even numbers. After 5, no prime number can end in 5. After 5, all prime numbers end in 1, 3, 7 or 9.