Question 375731
Numbers that end in 7 are sometimes divisible by 7 and 9. 
So check using 7 and 9.
{{{119547120987=3*3*7*7*191*479*2963}}}
There are other guidelines too.
Numbers that end in 2,4,6,8,0 are divisible by 2.
Numbers that end in 3 are sometimes divisible by 3.
Numbers that end in 0 or 5 are divisible by 5.
Numbers that end in 6 are sometimes divisble by 2 and 3.
Numbers that end in 9 are sometimes divisible by 3.