# Chapter 5 - Number Theory and the Real Number System - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1: 120

The given number is not divisible by $3$.

#### Work Step by Step

A number is divisible by $3$ if the sum of all its digits is divisible by $3$. The sum of the digits of the given number is: $=1+2+5+4+1+7+5+0 \\=25$ Note that $25$ is not divisible by $3$. Thus, the given number is not divisible by $3$.

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