It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 824 is not a prime number.
For example, 402 824 can be divided by 2: 402 824 / 2 = 201 412.
For 402 824 to be a prime number, it would have been required that 402 824 has only two divisors, i.e., itself and 1.
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402 824 is an even number, because it is evenly divisible by 2: 402 824 / 2 = 201 412.
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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 402 824 is about 634.684.
Thus, the square root of 402 824 is not an integer, and therefore 402 824 is not a square number.
The square of a number (here 402 824) is the result of the product of this number (402 824) by itself (i.e., 402 824 × 402 824); the square of 402 824 is sometimes called "raising 402 824 to the power 2", or "402 824 squared".
The square of 402 824 is 162 267 174 976 because 402 824 × 402 824 = 402 8242 = 162 267 174 976.
As a consequence, 402 824 is the square root of 162 267 174 976.
The multiples of 402 824 are all integers evenly divisible by 402 824, that is all numbers such that the remainder of the division by 402 824 is zero. There are infinitely many multiples of 402 824. The smallest multiples of 402 824 are: