It is 7 because the product of its prime factors are: 3*3*7 = 63
63 = 3 x 3 x 7
43 is a prime number because it has exactly two factors, 1 and 43. 33 and 63 each have 3 as a factor as well as 1 and themselves, so they are composite numbers.
No, 63 is not prime.
43 is the prime number.
43
43 is the only prime number in that list; 33 and 63 are both divisible by 3.
The greatest prime factor of 40 is 5. The greatest prime factor of 63 is 7. They do not have any prime factors in common.
63 has the factors 1, 3, 7, 9, 21, 63 43 is a prime number because there are no numbers that can divide into one and itself.
Because 7 is a factor of 28 and 63 and 7 is a prime number.
The common prime factor of 56 and 63 is 7.
63=3x3x7