Because an even number times an odd number is an even number.
Any even number multiplied by an odd number produces another even number. So
the odd number that you multiplied by becomes a factor of the bigger even number.
3 x 2 = 6
6 is an even number, but one of its factors is 3 .
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even numbers
No, only square numbers have an odd number of factors.
No. 24 has 3 as a factor. 30 has 15 as a factor.
Numbers with only two factors, the number itself and one, are called prime numbers. Examples of prime numbers are 2 (which is the only even prime number) and 17.
Factors come in pairs. It is only in the case of a square number that the two middle factors are equal and so are counted only once.