It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 874 is not a prime number.
For example, 402 874 can be divided by 2: 402 874 / 2 = 201 437.
For 402 874 to be a prime number, it would have been required that 402 874 has only two divisors, i.e., itself and 1.
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402 874 is an even number, because it is evenly divisible by 2: 402 874 / 2 = 201 437.
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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 402 874 is about 634.724.
Thus, the square root of 402 874 is not an integer, and therefore 402 874 is not a square number.
The square of a number (here 402 874) is the result of the product of this number (402 874) by itself (i.e., 402 874 × 402 874); the square of 402 874 is sometimes called "raising 402 874 to the power 2", or "402 874 squared".
The square of 402 874 is 162 307 459 876 because 402 874 × 402 874 = 402 8742 = 162 307 459 876.
As a consequence, 402 874 is the square root of 162 307 459 876.
The multiples of 402 874 are all integers evenly divisible by 402 874, that is all numbers such that the remainder of the division by 402 874 is zero. There are infinitely many multiples of 402 874. The smallest multiples of 402 874 are: