21, 55, 77, and 93 are composite numbers. 23 is a prime.
Chat with our AI personalities
Yes. 55 is a composite number and it is divisible by 1, 5, 11, 55
No, 23 is not a triangular number. Here are a few examples of triangular numbers: 21, 28, 55, 45, 78 and 91.
The composite factors of 1485 are 9, 15, 27, 33, 45, 55, 99, 135, 165, 297, 495, 1485
15, 49, 55, 87, 91,105 are the composite numbers.
composite because it has more than two factors