6 1 2 5 = 4 9 × 1 2 5
What is the smallest prime factor of 6125?
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Use a Prime Factor tree
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 = 1 4 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 .
Simple and easy. :-)
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!
6 1 2 5 = 4 9 × 1 2 5 = 7 × 7 × 5 × 2 5 = 7 × 7 × 5 × 5 × 5
From the above prime factorization, the smallest prime factor is 5 .
6 1 2 5 = 5 3 × 7 2
The answer is 5
That came out funny. Remember to use the Preview feature.
On prime factorization of 6125,We get that 6125= 5 × 5 × 5 × 7 × 7 and here 5 is the smallest prime factor.
WE CAN USE FUNDAMENTAL THEROREM OF AIRTHMETIC WE CAN EXPRESS 6125 AS THE PRODUCTS OF PRIMES- 6125 = 7 2 * 5 3 THEN WE CAN SEE THAT SMALLEST PRIME NUMBER IN THE PRIME FACTORISATION IS 5. SO THE ANSWER IS 5 .
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6125 = 7x7x5x5x5 so smallest prime factor is 5