Question

Is 45 a prime or composite number

Answer 1

Answer:

45 is a composite number because, it can be multiplied by 1,5,9,15 and 45.

Step-by-step explanation:

Answer 2

HOW TO SEE IF A NUMBER IS COMPOSITE

Look at its last digit. If it is 2,4,6,8,0 - it is 100% composite (only the digit 2 is prime)

2 is the only EVEN PRIME number.

Now, also 5.

If a number's last digit is 5, it's 100% composite.

I think that with other digits, it's 50%.

Therefore, we conclude that 45 is composite.