Factors Of 250
What is the combination of the two smallest basic factors of 250? 3
250 is divisible by 10 as it ends at 0.
Since it is divisible by 10, it is divisible by 2 and 5, which are prime numbers.
Check the division with 3: 2 + 5 + 0 = 7, which is not divisible by 3, ie cannot be divisible by 3.
Because 250 can be divided by 2 and 5, but not by 3:
2 and 5 should be the smallest basic factors. Your number is 7.
Note that you don't even get the 250 factor to fix it! Just find the 2 smallest key factors. Dial 2, 3, 5, 7, 11, ... unless the first two factors work.