No
21 isn't (= 3 x 7)
51 isn't (= 3 x 17)
81 isn't ( = 9 x 9)
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What are prime numbers from 1-150?
No a prime number can only be divided by 1 and itself. 144 is an even number, all even number can be divided by 2 (144/2=72) so no even numbers can be prime numbers.
The prime numbers from 1 - 5 are 2, 3, and 5.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. It is impossible to name all the prime numbers.
The sum of all prime numbers between 1 and 11 is 28.