It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 135 742 is not a prime number.
For example, 135 742 can be divided by 2: 135 742 / 2 = 67 871.
For 135 742 to be a prime number, it would have been required that 135 742 has only two divisors, i.e., itself and 1.
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135 742 is an even number, because it is evenly divisible by 2: 135 742 / 2 = 67 871.
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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 135 742 is about 368.432.
Thus, the square root of 135 742 is not an integer, and therefore 135 742 is not a square number.
The square of a number (here 135 742) is the result of the product of this number (135 742) by itself (i.e., 135 742 × 135 742); the square of 135 742 is sometimes called "raising 135 742 to the power 2", or "135 742 squared".
The square of 135 742 is 18 425 890 564 because 135 742 × 135 742 = 135 7422 = 18 425 890 564.
As a consequence, 135 742 is the square root of 18 425 890 564.
The multiples of 135 742 are all integers evenly divisible by 135 742, that is all numbers such that the remainder of the division by 135 742 is zero. There are infinitely many multiples of 135 742. The smallest multiples of 135 742 are: