It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 724 is not a prime number.
For example, 402 724 can be divided by 2: 402 724 / 2 = 201 362.
For 402 724 to be a prime number, it would have been required that 402 724 has only two divisors, i.e., itself and 1.
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402 724 is an even number, because it is evenly divisible by 2: 402 724 / 2 = 201 362.
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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 402 724 is about 634.605.
Thus, the square root of 402 724 is not an integer, and therefore 402 724 is not a square number.
The square of a number (here 402 724) is the result of the product of this number (402 724) by itself (i.e., 402 724 × 402 724); the square of 402 724 is sometimes called "raising 402 724 to the power 2", or "402 724 squared".
The square of 402 724 is 162 186 620 176 because 402 724 × 402 724 = 402 7242 = 162 186 620 176.
As a consequence, 402 724 is the square root of 162 186 620 176.
The multiples of 402 724 are all integers evenly divisible by 402 724, that is all numbers such that the remainder of the division by 402 724 is zero. There are infinitely many multiples of 402 724. The smallest multiples of 402 724 are: