If the last two digits of your target number are a multiple of 4, 4 is a factor of the whole number.
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Yes, 72 is a factor of 4.
No, 16 is a multiple of 4. 4 is a factor of 16.
A factor is a number that can be multiplied with another factor to create a product. 4 x 5 = 20 Four and five are factors of 20. Since 2 x 2 = 4, 2 is a factor of 4 and also a factor of a factor.
The Greatest Common Factor (GCF) is: 4