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its a multiple of 5....

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Q: How can you tell that 28655 is not a prime number by its last number?
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How can you tell 28655 not a prime number looking at the last digit?

All numbers ending in 0 and 5 are divisible by 5 and since 28655 ends in 5, it is divisible by 5 and therefore not prime.


How can you tell that 28655 is not a prime number?

Any number ending in 5 (or 0) is divisible by 5. 28655 = 5 x 5731 and is therefore not a prime number. Note: 5731 is also not a prime as it is divisible by 11 : 11 x 521 = 5731


How can you tell 28655 isn't an prime number?

It's greater than 5 and ends in 5.


How can you tell that 28655 isn't a prime number?

Any number that has a 5 or 0 in the ones place is divisible by 5. If a number is evenly divisible by another number, it is NOT prime.


Is 270 a prime number?

No. You can tell by looking at the last digit that it is divisible by both 10 and 2.


How can I tell wet her a number is prime?

One can tell whether a number is prime if it got only two divisors which is 1 and the number itself.


Is 392 prime?

No, you can tell by the last digit being divisible by two, that the number is divisible by two. Thus it's composite.


How could you use prime factorization to tell whether a number is even or odd?

its easy to tell that if the last number ends with 0,2,4,6,8,10,12,14,16,18,20 so on and so on then its even if the answer starts with a 1,3,5,7,9,11,13,15,17,19 so on so on then its an odd number


Is 29 an prime or composite number?

It is prime. Whenever you wanted to know a number is prime or composite, use this site. It can tell you the number is prime or not: prime-calculator dot com. It has lots of other abilities. Enjoy it.


How do you no if a number is prime or not?

A number is prime when it only has one and itself as factors is prime. 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.


How can you tell when a number is relatively prime?

A number is never relatively prime.Relatively prime refers to a pair of numbers.


A number that is not prime?

A prime number is any number that only has one and itself as factors. Threfore, any number taht has more than two factors is not prime. Check the the factors of a number to tell if it is prime or not.