It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 402 is not a prime number.
For example, 638 402 can be divided by 2: 638 402 / 2 = 319 201.
For 638 402 to be a prime number, it would have been required that 638 402 has only two divisors, i.e., itself and 1.
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638 402 is an even number, because it is evenly divisible by 2: 638 402 / 2 = 319 201.
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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 638 402 is about 799.001.
Thus, the square root of 638 402 is not an integer, and therefore 638 402 is not a square number.
The square of a number (here 638 402) is the result of the product of this number (638 402) by itself (i.e., 638 402 × 638 402); the square of 638 402 is sometimes called "raising 638 402 to the power 2", or "638 402 squared".
The square of 638 402 is 407 557 113 604 because 638 402 × 638 402 = 638 4022 = 407 557 113 604.
As a consequence, 638 402 is the square root of 407 557 113 604.
The multiples of 638 402 are all integers evenly divisible by 638 402, that is all numbers such that the remainder of the division by 638 402 is zero. There are infinitely many multiples of 638 402. The smallest multiples of 638 402 are: