find a random number, square each digit, then add up your answers.
do this again and again until you reach 1.
eg: (lets pretend ∞ means squared)
13.....
1∞ + 3∞
= 1 + 9
= 10
= 1∞ + 0 ∞
=1
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happiness does not have a number
No.
The Wikipedia article lists the first happy numbers as 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, ..., so the answer is clearly no.
The Number (39) is Unhappy Number or Sad Number.
Well if you mean positive then yes a positive times a positive is always a positive! Those numbers always have their calculators half full :)