Definition of Factor in Math. A factor is just a divisor of a number. For instance, in this picture

Definition of Factor

A factor is just a number that evenly divides another number.
• 3 is a factor of 15 because $$15 \div 3$$ is an whole number (5)
• 6 is a factor of 18 because $$18 \div 6$$ is an whole number (3)
• 5 is a factor of 15 because $$15 \div 5$$ is an whole number (3)
• 2 is a factor of 12 because $$12 \div 2$$ is an whole number (6)
• 3 is not a factor of 14 because $$14 \div 3$$ is not a whole number
• 6 is not a factor of 22 because $$22 \div 6$$ is not a whole number

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