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No. Consider 15: 1,3,5,15

Every positive whole number has an even number of factors,

unless the number is a perfect square.

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Q: Do odd numbers always have an odd number of factors?
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Related questions

Is the product of an odd number of factors always a negative number?

Only if an odd number of the factors are negative numbers.


Numbers that have an odd number of factors?

Square numbers have an odd number of factors.


Can an odd number have odd numbers of factors?

Yes. Square numbers have an odd number of factors. 49 has three factors.


Numbers with an odd number of factors?

Square numbers have an odd number of factors.


What middle numbers have an odd number of factors?

Square numbers have an odd number of factors.


What type of numbers has an odd number of factors?

Square numbers have an odd number of factors.


Odd number of factors?

Square numbers have an odd number of factors.


Will a prime number always have an odd numbers of factors?

All prime numbers have only 2 factors which are themselves and one. Al prime numbers are odd numbers except for 2 which is the only even prime number.


What numbers with an odd numbers of factors?

Perfect squares have an odd number of factors.


Is the gcf of a odd number and an even number always even?

The GCF of an odd and even number is never even.


Is the GCF of any two numbers always odd and why?

The GCF of any two odd numbers is always odd because odd numbers don't have any even factors. The GCF of any two even numbers is always even because even numbers are divisible by two and any common factors would have at least one two in common. The GCF of an even and an odd number is odd because odd numbers don't have any even factors.


What type of number has odd numbers as factors?

Both odd and even numbers may have odd numbers as factors.