Question

which number is not a factor of 114?
4
2
19
57

Explanation:

Step1: Recall factor definition

A factor of a number divides it without remainder.

Step2: Check divisibility by 2

$114 \div 2 = 57$, remainder 0. So 2 is a factor.

Step3: Check divisibility by 4

$114 \div 4 = 28.5$, not an integer. Remainder exists.

Step4: Check divisibility by 19

$114 \div 19 = 6$, remainder 0. So 19 is a factor.

Step5: Check divisibility by 57

$114 \div 57 = 2$, remainder 0. So 57 is a factor.

Answer:

4 (the number 4 is not a factor of 114)