693 is evenly divisible by 3. You can tell that at a glance because every one of its digits is evenly divisible by 3.
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693 693 / 3 = 231 693 / 7 = 99 693 / 9 = 77 693 / 11 = 63
If any number's digits add up to a multiple of 3, then that number is a multiple of 3. For this number, 6 + 9 + 3 = 18, and 18 is a multiple of 3 (if we didn't know that, we could see that 1 + 8 = 9, which is a multiple of 3). That means we can divide 693 by 3, and we get 231. Is 231 divisible by 3? Well, 2 + 3 + 1 = 6, so it is. Divide 231 by 3 and you get 77. That means 77 * 3 * 3 = 693.
10*3=30 693-30=663 lots of 3
693 can be expressed as the product of prime numbers as 3 * 3 * 7 * 11.
231 = 693