The number 630 is divisible by 42. Which statement correctly explains why, using the divisibility property?

Because 630 is divisible by 2 and 21, and $\gcd(2, 21) = 1$.

Because 630 is divisible by 6 and 7, and $\gcd(6, 7) = 1$.

Because 630 is divisible by 3 and 14, and $\gcd(3, 14) = 1$.

Which of the following statements is false?

If a number is divisible by 5 and 9, it must be divisible by 45.

If a number is divisible by 4 and 9, it must be divisible by 36.

If a number is divisible by 4 and 10, it must be divisible by 40.

If a number is divisible by 7 and 8, it must be divisible by 56.