It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 744 is not a prime number.
For example, 402 744 can be divided by 2: 402 744 / 2 = 201 372.
For 402 744 to be a prime number, it would have been required that 402 744 has only two divisors, i.e., itself and 1.
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402 744 is an even number, because it is evenly divisible by 2: 402 744 / 2 = 201 372.
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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 402 744 is about 634.621.
Thus, the square root of 402 744 is not an integer, and therefore 402 744 is not a square number.
The square of a number (here 402 744) is the result of the product of this number (402 744) by itself (i.e., 402 744 × 402 744); the square of 402 744 is sometimes called "raising 402 744 to the power 2", or "402 744 squared".
The square of 402 744 is 162 202 729 536 because 402 744 × 402 744 = 402 7442 = 162 202 729 536.
As a consequence, 402 744 is the square root of 162 202 729 536.
The multiples of 402 744 are all integers evenly divisible by 402 744, that is all numbers such that the remainder of the division by 402 744 is zero. There are infinitely many multiples of 402 744. The smallest multiples of 402 744 are: