It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 358 is not a prime number.
For example, 402 358 can be divided by 2: 402 358 / 2 = 201 179.
For 402 358 to be a prime number, it would have been required that 402 358 has only two divisors, i.e., itself and 1.
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402 358 is an even number, because it is evenly divisible by 2: 402 358 / 2 = 201 179.
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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 402 358 is about 634.317.
Thus, the square root of 402 358 is not an integer, and therefore 402 358 is not a square number.
The square of a number (here 402 358) is the result of the product of this number (402 358) by itself (i.e., 402 358 × 402 358); the square of 402 358 is sometimes called "raising 402 358 to the power 2", or "402 358 squared".
The square of 402 358 is 161 891 960 164 because 402 358 × 402 358 = 402 3582 = 161 891 960 164.
As a consequence, 402 358 is the square root of 161 891 960 164.
The multiples of 402 358 are all integers evenly divisible by 402 358, that is all numbers such that the remainder of the division by 402 358 is zero. There are infinitely many multiples of 402 358. The smallest multiples of 402 358 are: