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A factor divides a number completely without leaving any remainder.
Example 1:

Example 2: Is 5 is a factor of 35?

Procedure:
Step 1: Divide 35 by 5.

Step2: If 5 divides 35 completely, then it is the factor of 35.

Step3: If 5 does not divides 35 completely, then it is not a factor of 35.
Step 4: As 5 divides 35 completely, hence 5 is the factor of 35.

Properties of factors:

 Every non-zero number has a limited number of factors.

Example1: All factors of 6 is 1, 2, 3, 6

Example2:All factors of 19 is 1, 19.

 1 is a factor of every number as 1 divides every number exactly.
Example1: 25 ÷ 1 = 25
 1 is the smallest factor of all non-zero number.

Example1: All factors of 6 is 1, 2, 3, 6

Example2: All factors of 19 is 1, 19.

 The largest factor of every non-zero number is the number itself.
Example1:Underline the largest factors of 6 is 1, 2, 3, 6

Example2:Underline the largest factors of 19 is 1,19.

 Every non-zero number is the factor of ‘0’