Question: How does one find the prime factorization of a number like 1820?
Answer: Attempt division by prime numbers, starting with the smallest. If division is possible continue with the quotient and the same prime number. If division is not possible then move the next largest prime number.
On the next slide we see that 1820 can be factored
1820 = 2 * 2 * 5 * 7 * 13.