If 2 is a factor, the number is even.
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The factors of 2 are 1 and 2. If you increase something by a factor of 2, you double it. If you decrease something by a factor of 2, you halve it.
No, 2 is a factor of even numbers.
The greatest common factor of two and four is 2.
In order to determine if 2 is a factor of 49 (or any other number), ask yourself if the number is even or odd. If the number is odd, it is not a factor of 2. 49 is odd, so 2 is not a factor of 49. You can also divide 2 into the number. If there is no remainder, 2 is a factor of the number. 49 divided by 2 is 24 with a remainder of 1, so 2 is not a factor of 49.
Yes it is. 2 is a factor because 492 ends in 2, 3 is a factor because 4+9+2 is divisible by 3. So 6 is a factor.