It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 642 342 is not a prime number.
For example, 642 342 can be divided by 2: 642 342 / 2 = 321 171.
For 642 342 to be a prime number, it would have been required that 642 342 has only two divisors, i.e., itself and 1.
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642 342 is an even number, because it is evenly divisible by 2: 642 342 / 2 = 321 171.
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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 642 342 is about 801.462.
Thus, the square root of 642 342 is not an integer, and therefore 642 342 is not a square number.
The square of a number (here 642 342) is the result of the product of this number (642 342) by itself (i.e., 642 342 × 642 342); the square of 642 342 is sometimes called "raising 642 342 to the power 2", or "642 342 squared".
The square of 642 342 is 412 603 244 964 because 642 342 × 642 342 = 642 3422 = 412 603 244 964.
As a consequence, 642 342 is the square root of 412 603 244 964.
The multiples of 642 342 are all integers evenly divisible by 642 342, that is all numbers such that the remainder of the division by 642 342 is zero. There are infinitely many multiples of 642 342. The smallest multiples of 642 342 are: