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28655 ends with a 5, therefore it must be divisible by 5.
A Prime number is something that cannot be divided at all (At least without creating a decimal).
If you can divide 28655 by 5, then it cannot be a prime number.
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How can you tell that 28655 is not a prime number by its last number?
Any number, however, large, that ends in '5' or '0' is divisible by '5'. Hence 28655 ends in '5' , so it is divisible by '5' . there by it is NOT a prime number. 28655 is a compound number. 5)28655 = 5731
Why 28655 isn't a prime number?
The only prime number that ends in 5 is 5.
Why is 28655 not a prime number?
Because it has many Factors 1, 5, 11, 55, 521, 2605, 5731, 28655
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.
