Question

Find factors of a product of two unknown prime numbers

Answer 1

A number is divisible by 2 if the last (ones) digit is divisible by 2. That is, the last digit is 0, 2, 4, 6, or 8. (We then say the number is an even number.) For example, in the number 236, the last digit is 6. Since 6 is divisible by 2 (6 ÷ 2 = 3), 236 is divisible by 2.

A number is divisible by 10 if the last digit is 0. For example, 520 is divisible by 10 (last digit is 0).