Which of the following is a composite number 63?

• As we already know that, the number having factors 1 and the number itself is the prime number.
• And numbers having more than these two factors are the composite numbers.
• To check whether the number 63 is composite or not first we have to find its factors.

Factors of 63:

• If we have taken numbers from 1, 2, 3…for checking factors of 63, we found that 63 has factors 1, 3, 7, 9, 21 and 63. Hence, we must say that 63 is a composite number.
• Thus, 63 is the composite number.
• If we multiply 63 by 1, 2, 3 then we get the multiples of 63 which are 63, 126, and so on.

About the number 63:

• 63 has more than two factors which are 1,3, 7, 9, 21and 63 and hence it is the composite number.
• 63 is the odd composite number and it is not the perfect square also.
• If we divide 63 by 1, 3, 7, 9, 21 and 63 then we get remainder as zero. Hence, 1, 3, 7, 9, 21 and 63 are the factors of 63.

Note:

• 63 is not the perfect square.
• Factors of 63: 1, 3, 7, 9, 21 and 63
• Prime factors of 63: 3, 7

Conclusion: 

• 63 is the composite number which has factors 1, 3, 7, 9, 21 and 63.
• And hence, 63 is not the prime number.

Multiple Choice Questions:

1) 63 is a

a) odd number

b) Prime number

c) Composite number

d) Both a and c

Ans: d) both a and c

2) The prime factors of a composite number 63 are

a) 1

b) 3, 7

c) Both a and b

d) 631

Ans: b) 3, 7

3) 1 is the not prime factor of 63 because

a) It is the prime number

b) 1 is neither prime nor composite number

c) Both a and b

d) Given statement is false

Ans: b) 1 is neither prime nor composite number