It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 642 142 is not a prime number.
For example, 642 142 can be divided by 2: 642 142 / 2 = 321 071.
For 642 142 to be a prime number, it would have been required that 642 142 has only two divisors, i.e., itself and 1.
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642 142 is an even number, because it is evenly divisible by 2: 642 142 / 2 = 321 071.
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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 642 142 is about 801.338.
Thus, the square root of 642 142 is not an integer, and therefore 642 142 is not a square number.
The square of a number (here 642 142) is the result of the product of this number (642 142) by itself (i.e., 642 142 × 642 142); the square of 642 142 is sometimes called "raising 642 142 to the power 2", or "642 142 squared".
The square of 642 142 is 412 346 348 164 because 642 142 × 642 142 = 642 1422 = 412 346 348 164.
As a consequence, 642 142 is the square root of 412 346 348 164.
The multiples of 642 142 are all integers evenly divisible by 642 142, that is all numbers such that the remainder of the division by 642 142 is zero. There are infinitely many multiples of 642 142. The smallest multiples of 642 142 are: