## GMAT. How do you tell if a number is divisible by a divisor using prime factors?

Say I have a dividend (15) and a divisor (6). Using prime numbers, how do I tell if the dividend is divisible by the divisor? The primes for 15 are $5^13^1$. The primes for 6 are $3^12^1$. What’s the rule regarding prime factors and divisibility? The divisor needs to have only the prime factors of … Read more