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No, there are composite numbers that end in every other digit.
All numbers that are greater than 5 and end in 5 are composite numbers because they are divisible by 5 in addition to 1 and the number itself. 655 is therefore a composite number.
No prime numbers end in 0. 130 is a composite.
Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.
composite numbers are those that have more than 2 factors. all even numbers other than 2 are composite numbers and some odd numbers are composite numbers. numbers that are prime are the numbers that are not composite numbers i hope this answers your question :)