It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 158 509 is not a prime number.
For example, 158 509 can be divided by 13: 158 509 / 13 = 12 193.
For 158 509 to be a prime number, it would have been required that 158 509 has only two divisors, i.e., itself and 1.
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158 509 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 158 509 is about 398.132.
Thus, the square root of 158 509 is not an integer, and therefore 158 509 is not a square number.
The square of a number (here 158 509) is the result of the product of this number (158 509) by itself (i.e., 158 509 × 158 509); the square of 158 509 is sometimes called "raising 158 509 to the power 2", or "158 509 squared".
The square of 158 509 is 25 125 103 081 because 158 509 × 158 509 = 158 5092 = 25 125 103 081.
As a consequence, 158 509 is the square root of 25 125 103 081.
The multiples of 158 509 are all integers evenly divisible by 158 509, that is all numbers such that the remainder of the division by 158 509 is zero. There are infinitely many multiples of 158 509. The smallest multiples of 158 509 are: