It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 142 638 is not a prime number.
For example, 142 638 can be divided by 2: 142 638 / 2 = 71 319.
For 142 638 to be a prime number, it would have been required that 142 638 has only two divisors, i.e., itself and 1.
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142 638 is an even number, because it is evenly divisible by 2: 142 638 / 2 = 71 319.
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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 142 638 is about 377.674.
Thus, the square root of 142 638 is not an integer, and therefore 142 638 is not a square number.
The square of a number (here 142 638) is the result of the product of this number (142 638) by itself (i.e., 142 638 × 142 638); the square of 142 638 is sometimes called "raising 142 638 to the power 2", or "142 638 squared".
The square of 142 638 is 20 345 599 044 because 142 638 × 142 638 = 142 6382 = 20 345 599 044.
As a consequence, 142 638 is the square root of 20 345 599 044.
The multiples of 142 638 are all integers evenly divisible by 142 638, that is all numbers such that the remainder of the division by 142 638 is zero. There are infinitely many multiples of 142 638. The smallest multiples of 142 638 are: