It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 158 402 is not a prime number.
For example, 158 402 can be divided by 2: 158 402 / 2 = 79 201.
For 158 402 to be a prime number, it would have been required that 158 402 has only two divisors, i.e., itself and 1.
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158 402 is an even number, because it is evenly divisible by 2: 158 402 / 2 = 79 201.
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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 158 402 is about 397.997.
Thus, the square root of 158 402 is not an integer, and therefore 158 402 is not a square number.
The square of a number (here 158 402) is the result of the product of this number (158 402) by itself (i.e., 158 402 × 158 402); the square of 158 402 is sometimes called "raising 158 402 to the power 2", or "158 402 squared".
The square of 158 402 is 25 091 193 604 because 158 402 × 158 402 = 158 4022 = 25 091 193 604.
As a consequence, 158 402 is the square root of 25 091 193 604.
The multiples of 158 402 are all integers evenly divisible by 158 402, that is all numbers such that the remainder of the division by 158 402 is zero. There are infinitely many multiples of 158 402. The smallest multiples of 158 402 are: