priME

6125 = 49 × 125 6125 = 49 \times 125

What is the smallest prime factor of 6125?


The answer is 5.

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8 solutions

Anvit Dhiman
Oct 21, 2013

6125 = 7x7x5x5x5 so smallest prime factor is 5

Use a Prime Factor tree

Amin Hashmi - 7 years, 7 months ago
Michael Fuller
May 27, 2016

Even without the right-hand side we can simply find the smallest prime factor. Go through the primes starting from 2 and see if they divide 6125.

Evidently 2 does not divide 6125 as it is odd, and 3 does not divide it either since 6 + 1 + 2 + 5 = 14 6+1+2+5=14 and 3 does not divide 14 (this is the standard test for checking if an integer is divisible by 3 - add up the digits and if that number is divisible by 3, so is the original number).

The next prime is 5, and this divides 6125 as it ends in a 5 or 0. The smallest prime factor of 6125 is therefore 5 \large \color{#20A900}{\boxed{5}} .

Simple and easy. :-)

Whitney Clark - 5 years ago

thats all I did. No need to actually figure out all the factors, just start at 2 and keep checking until you find the first factor that works. Not 2, not 3, not 4, 5-yes!

Barbara Maidelis - 5 years ago

6125 = 49 × 125 = 7 × 7 × 5 × 25 = 7 × 7 × 5 × 5 × 5 6125=49 \times 125=7 \times 7 \times 5 \times 25 = 7 \times 7 \times 5 \times 5 \times 5

From the above prime factorization, the smallest prime factor is 5 5 .

Munem Shahriar
Dec 8, 2017

6125 = 5 3 × 7 2 6125 = 5^3 \times 7^2

The answer is 5 \boxed{5}

Iranna Hubballi
Apr 8, 2014

6125 = 5 5 5 7 7

That came out funny. Remember to use the Preview feature.

Whitney Clark - 5 years ago
Anandhu Raj
Feb 21, 2014

On prime factorization of 6125,We get that 6125= 5 × 5 5\times5 × 5 \times5 × 7 \times7 × 7 \times7 and here 5 is the smallest prime factor.

Devesh Rai
Nov 9, 2013

WE CAN USE FUNDAMENTAL THEROREM OF AIRTHMETIC WE CAN EXPRESS 6125 AS THE PRODUCTS OF PRIMES- 6125 = 7 2 7^{2} * 5 3 5^{3} THEN WE CAN SEE THAT SMALLEST PRIME NUMBER IN THE PRIME FACTORISATION IS 5. SO THE ANSWER IS 5 \boxed{5} .

HamzAh Rana
Oct 25, 2013

5 yar itz simple

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