It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 738 is not a prime number.
For example, 402 738 can be divided by 2: 402 738 / 2 = 201 369.
For 402 738 to be a prime number, it would have been required that 402 738 has only two divisors, i.e., itself and 1.
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402 738 is an even number, because it is evenly divisible by 2: 402 738 / 2 = 201 369.
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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 402 738 is about 634.616.
Thus, the square root of 402 738 is not an integer, and therefore 402 738 is not a square number.
The square of a number (here 402 738) is the result of the product of this number (402 738) by itself (i.e., 402 738 × 402 738); the square of 402 738 is sometimes called "raising 402 738 to the power 2", or "402 738 squared".
The square of 402 738 is 162 197 896 644 because 402 738 × 402 738 = 402 7382 = 162 197 896 644.
As a consequence, 402 738 is the square root of 162 197 896 644.
The multiples of 402 738 are all integers evenly divisible by 402 738, that is all numbers such that the remainder of the division by 402 738 is zero. There are infinitely many multiples of 402 738. The smallest multiples of 402 738 are: