153 is a multiple of 3.
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The number is -153
0.0654
153
Only one method as I know is.... First figure out perfect square above 23341. i.e. 23409=153*153. Now, divide 23341 with all the prime numbers comes before 153. If 23341 cannot be divided with any of the prime number then this number will be a prime. If in case any one number divides completely 23341 then this will not a prime.
15.3