Question 400868
If the units digit is {{{0}}}, the
number is divisible by {{{10}}} ,and not prime
If the units digit is {{{4}}},
it is divisible by {{{2}}}
If the units digit is {{{5}}}, it
is divisible by {{{5}}}
If the units digit is {{{7}}}, the
number could be prime.
{{{37}}} is a prime number
{{{77}}} 1s not prime