Any number that ends with 0 or 5 is divisible by 5.
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It is: 13
It is 13 because it is the HCF of 325 and 221
The prime factorization of 325 is: 5 × 5 × 13
5To get the number of prime numbers in a number, divide by the lowest prime number that divides exactly, then keep going until you end up with a prime number. 300 - 2150 - 275 - 325 -55
As a product of its prime factors: 5*5*13 = 325